Who has the answers to the 300 application questions that must be done in the test?

1. There is a new batch of schoolbags in the children's shop, which sold 30% in the morning and 40 in the afternoon, leaving just half. How many schoolbags are there in this batch?

40÷(50%-30%)

=40÷20%

=200

2. A factory has two workshops, A and B, and the employee ratio is 3: 5. If 120 people are transferred from Workshop A to Workshop B, the ratio of employees in Workshop A and Workshop B is 3: 7. How many people are there in Workshop A and Workshop B?

120÷( 7/ 10-5/8)

= 120÷3/40

= 1600 people

A: 1600×3/8=600 people.

B: 1600×5/8= 1000 people.

3. A motorcycle 1/2 hours for 30 kilometers. How many kilometers does it travel per hour? How many hours does it take him to drive 1 km?

30 ÷1/2 = 60km

1÷60= 1/60 hours

Among the students reading in the reading room, boys account for four out of seven. After five male students walked out of the reading room, female students accounted for two-thirds of the reading students. How many students were reading in the original reading room?

There are x students.

( 1-4/7)x=(x-5)

x=28

There are 62 red, yellow and blue balloons, of which three-fifths of the red balloons are equal to two-thirds of the yellow balloons, and there are 24 blue balloons. How many are Red Balloon and Yellow Balloon?

62-24=38 (only)

3/5 red =2/3 yellow

9 Red = 10 Yellow Red: Yellow = 10:9

38/( 10+9)=2

Red: 2× 10=20

Yellow: 2×9= 18

There are 36 students reading in the school reading room, 4/9 of whom are female students. Later, several female students came. At this time, the number of female students accounts for 3/5 of the readers. Later, several female students came.

Original female student: 36×4/9= 16 (person)

Former male classmate: 36- 16=20 (person)

Total number of employees: 20( 1-3/5)= 50 (persons)

Female: 50×3/5=30 (person)

Number of female students: 30- 16= 14 (person)

7. When water becomes ice, its volume is 1 1/0. 2./kloc-what is the volume of 0/6 cubic meter of ice after melting into water?

2.16/(1+11) =1.98 (m3)

8. Party A's grain is 560 tons. If 2/9 of Party A's grain is shipped to Party B, Party A's grain is exactly the same. How many tons of grain does Party A have? How many tons of grain does B have?

Now both parties have their own.

560 ÷ 2 = 280 tons

It turns out that A has 280÷ (1-2/9) = 360 tons.

It turns out that B has 560-360 = 200 tons.

9. The price of TV sets has been reduced in 200 yuan. That's 2/ 1 1. What's the price of this TV set now?

The original price is 200 ÷ 2/ 1 1 = 2200 yuan.

The current price is 2200-200 = 2000 yuan.

10.A has traveled 2/5 of the way from a to b, which is more than 20 kilometers. At this time, there are still 70 kilometers from B. How many kilometers are there between A and B?

Full time

1-2/5=3/5

20+70 = 90km

The distance between Party A and Party B is 90 ÷ 3/5 = 150km.

1 1, Xiaoming reads a book. On the first day, he read 28 pages. The next day, he read the whole book 1/5 (1). Last two days, * * * read 3/8 (8/3) of the whole book. How many pages does this book have?

What I read on the first day accounts for 3/8- 1/5 = 7/40 of the whole book.

This book * * * has 28 pages/7/40 =160.

12, the master and the apprentice process a batch of parts. After processing for a period of time, the main processing 84 parts. Apprentices process 63 parts. The master handles more tasks than the apprentice, accounting for 1/28 of all tasks. How many parts are there in this batch?

Suppose this batch has x parts.

1/28X=84-63

1/28X= 19

X=532

13, a barrel of oil, after eating 7/ 10, add 15 kg. At this time, the oil in the barrel is exactly half of that in a barrel. How much does this barrel of oil weigh?

15 ÷ (7/10-1/2) = 75 (kg)

14. A train from Shanghai to Tianjin has traveled 3/5 of the whole journey. If you drive at 106 km/h, you can reach Tianjin in five hours. How many kilometers is the railway from Shanghai to Tianjin?

( 106*5)/( 1-(3/5))

=530/0.4

=1325km

/kloc-There are 46 students in grades 0/5 and 6 who participate in math interest groups, among which 4/5 girls are 3/2 times as many as boys. How many boys and girls joined the interest group?

The ratio of male to female students is 4/5: 3/2 = 8: 15.

Number of boys: 46/(8+ 15)*8= 16.

The number of girls is 46- 16=30.

16, a car consumes 4/5 kilograms of fuel every 8 kilometers, and how many kilometers per kilogram of gasoline is feasible on average. How many kilograms does driving 1 km consume?

8÷4/5= 10 (km/)

4/5÷8=0. 1 (kg)

17. Two trains leave from two cities 600 kilometers apart at the same time. One train runs at 60 kilometers per hour, and the other train runs at 75 kilometers per hour. How many hours will the two trains meet?

600/(60+75)=40/9 (hours)

18. A motorcycle travels 64 kilometers per hour. It takes 3/4 hours to find this speed from a to b. How many kilometers is it between A and B?

64× 3/4 = 48km

19. The fruit shop sold out a batch of fruits in two days. On the first day, 3/5 of the total fruit weight was sold, 30 kilograms more than the next day. How many kilograms are there in this batch of fruit?

1-3/5=2/5

3/5-2/5= 1/5

30/1/5 =150kg

20. Jessie Primary School has 9 10 students, seven quarters of whom are girls. How many are girls? How many boys are there?

9 10×4/7=520 ... girls

9 10-520=390 ... boys

2 1, a rectangular piece of land, 60 meters long and 2/5 wide. What is the area of this land?

4/5×5/8 =(4×5)÷(5×8)= 1/2(m)

4/5- 1/2 = 8/ 10-5/ 10 = 3/ 10(m)

22. The ratio of red goldfish to black goldfish in the goldfish pond is 7:3. There are 9 black goldfish. How many red goldfish are there?

9 ÷ 3× 7 = 2 1

There are 23 and 6 grades 132 students, of which the ratio of male to female is 6: 5. How many boys and girls are there in the sixth grade?

132 ÷ (6+5) = 12 people

Boys 12×6 = 72.

Girls 12×5 = 60.

24. The ratio of A to B is 2:3, and the ratio of B to C is 4:5. Find the ratio of a to C.

A: B = 2: 3 = 8: 12。

B: C = 4: 5 = 12: 15。

A: B: C = 8: 12: 15.

A: C = 8: 15

25. The number of trees planted in Jiefang Road Primary School this year is 65438+ 0.2 times that of last year. Write down the ratio between the number of trees planted in this primary school this year and the number of trees planted last year.

1.2: 1=6:5

Last year, the ratio of the output of color TV sets to the total output of TV sets in a TV factory was 9/20. Last year, * * * produced 250,000 TV sets, including how many color TV sets?

250000× 20/9 =112500 sets.

27. Workers in a factory account for two-thirds of the total number of employees in the factory, technicians account for two-ninth of the total number of employees in the factory, and the rest are cadres. Write down the proportion of workers, technicians and cadres in this factory.

Cadres account for 1-3/2-9/2 = 9/ 1 of the total number of employees in the factory.

The ratio of workers, technicians and cadres in this factory is 3/2: 9/2: 9/1= 6: 2:1.

The number of students in a class is between 40 and 50, and the ratio of male to female is 5:6.

How many boys and girls are there in this class?

There are 44 males (5+6) × 5 = 20.

There are 44-20 girls = 24.

29. The ratio of science and technology books to literature and art books in the library is 4: 5. After purchasing 300 works of art, the ratio of science and technology books to literature and art books is 5: 7. What percentage of literature and art books have increased?

Original literary works: 300 ÷ (7/12-5/9) =10800 (this).

The number of literary and artistic books increased: 300÷ 10800≈2.8%.

30. Last year, Factory A and Factory B completed 1 12% and 1 10% respectively, and * * * produced 4,000 tons of grain, 400 tons more than the sum of the original plans of the two factories. What is the initial production task of Factory A?

The original production task of a factory is X.

1 12% x+ 1 10%×(3600-x)= 4000

1. 12x+3960- 1. 1x = 4000

0.02x=40

x=2000

There are only 175 students in grades 3 1, 5 and 6. Divide into three groups to participate in the activities. The ratio of the first group to the second group is 5: 4, and the third group has 67 people. How many people are there in the first and second groups?

The first and second groups have 175 students -67 students = 108 students.

One group has 108 students ×5/9=60 students.

The second group has 108 people ×4/9=48 people.

32. There are 465 students in a school, of whom 2/3 are girls and 20 are less than 4/5 boys. How much is the male and female?

Two thirds of the girls are 20 less than four fifths of the boys.

Girls are less than boys by 20/(2/3)= 30(4/5)/(2/3)= 6/5.

Boys have

(465+30)/( 1+6/5)=225 (person)

Girls have

465-225=240 (person)

33, a manuscript, typed 1 of the whole manuscript on the first day, typed 2/5 the next day, and typed 9 pages more than the first day. How many pages are there in this manuscript?

9 divided by (2/5-65438/7+0)

=9 divided by 9 of 35.

=35 pages

This manuscript has 35 pages.

34. A piece of land has an aspect ratio of 8: 5, and the length is 24 meters more than the width. How many square meters is this land?

If the length is 8 and the width is 5, it is more than 3, which is 24 meters.

Then one is: 24÷3=8 meters.

That is, the length is 8× 8 = 64m and the width is 8× 5 = 40m.

Area: 64× 40 = 2560m2.

35. If there are 25% more boys than girls, how many girls are less than boys?

For boys, 1+25% = 125%.

The number of girls is less than that of boys (125%-1) ÷125% = 20%.

36. The breeding factory has raised 1987 pigs this year, which is three times less than that raised last year by 245 pigs. How many more pigs have been raised this year than last year?

Pig raising last year: (1987+245) ÷3=744

Raise more pigs this year than last year: 1987-744= 1243.

37. The ratio of Xiao Wei and Xiaoying's donation to Project Hope is 2:5. Xiaoying donated 35 yuan. How much did Xiao Wei donate?

Let Xiao Wei donate X yuan.

2:5=X:35

X= 14

38. The average value of three numbers is 8.4, of which the first number is 9.2, and the second number is 0.8 less than the third number. What is the third number?

Solution: Let the third number be x and the column equation be:

3×[9.2+(x-0.8)+x]=8.4

x=8.4

39. There are two ropes. The length of the first rope is 1.5 times that of the second rope. The second one is 3 meters shorter than the first one. How long are these two ropes?

If the first root is x meters long, the second root is 1.5x meters long.

1.5x-x=3

0.5x=3

x=6

6× 1.5 = 9 (m)

The first one is 6 meters long.

The second one is 9 meters long.

40. The construction team built a road, and the repaired length and the remaining ratio were 4: 5. If you build another 25 meters, it will just reach the midpoint of this road. What is the total length of this road?

4+5=9

Solution: Let this road be x meters long:

(5/9-4/9)x=25

1/9x=25

x=225

4 1. Cut a circular piece of paper into several small sectors with equal areas along the radius and put them together to form an approximate rectangle. The circumference of the new pattern is longer than that of the circular paper 16 cm. Find the area of this round paper.

Then the radius is: 16÷2=8.

The area of the circle is: 3. 14×8×8=200.96cm?

42. The sum of the number of excavators and the number of loading and unloading vehicles in a development zone site is 2 1. If each excavator digs an average of 750 cubic meters of soil every day, it will just allow the excavated soil to be shipped out in time. What are the number of excavators and loaders?

Set excavator x, and then install 21-x.

750×X=(2 1-X)×300

X= 14

43. My sister was twice as old as her four years ago, and this year she is 1.5 times as old as her sister. Ask my sister how old she is this year.

Suppose: my sister was x four years ago.

Four years ago, my sister X2

(X+4)÷(X÷2+4)= 1.5

X=8

My sister is 8+4= 12 years old this year.

44. Arbor Day, 170 Senior three students went to participate in voluntary tree planting activities. If boys can dig three tree pits a day and girls can plant seven trees a day, then only one tree will be planted in each tree pit. How many men and women are there?

Solution: There are X boys and (170-X) girls.

3X=7( 170-X)

X= 1 19

170- 1 19 =5 1

A: Boys 1 19, girls 5 1.

45. There is a copper wire, 40 meters long, which goes around the circular tube 12 times, leaving 2.32 meters. Find the diameter of the circular tube.

40-2.32 = 37.68m.

37.68÷ 12=3. 14 (m)

Diameter: 3.14 ÷ 3.14 =1(m)

46. When transporting a batch of goods, the first shipment is 20%, the second shipment is 6 tons, and the third shipment is 2 tons, which is less than the previous two shipments. At this time, the remaining one-third of the goods have not been transported. How many tons are there in this shipment?

Let's assume that the total quantity of this shipment is x tons.

X-20%X-6- 1/3X=20%X+6-2

For the column equation, X = 37.5.

47. Cut a circle along the radius and piece it together into an approximate rectangle. Given that the circumference of a rectangle is 4 1.4 cm, what is the circumference of this circle?

Solution: let the radius be x cm,

(3. 14×2x)+2x=4 1.4

6.28x+2x=4 1.4

8.28x=4 1.4

x=5

5× 2× 3. 14 = 3 1.4 cm2

48. A factory produced 350 products in the first half of the month, with a qualified rate of 90%; 450 pieces were produced in the second half of the month, and the qualified rate was 96%. What is the product qualification rate this month?

350×90%=3 15 pieces

450×96%=432 pieces

(432+3 15) ÷(350+450) × 100%

=747÷800× 100%

=93.375%

49. Among the two stores, the profit of Store A increased by 25% and that of Store B decreased by 25%, so the profits of these two stores are the same. What percentage was the profit of store B originally?

1÷( 1+25%)=4/5

1÷( 1-25%)=4/3

4/5÷4/3=60%

50. 8800 kilograms of apples and pears were harvested in the orchard. There are 20% more apples than pears. How much are these two fruits?

Pear 8800/(1+20%+1) = 4000 Jin.

Apple 8800-4000=4400 Jin

5 1. The road construction team plans to complete a road within 30 days, and 45% of the plan will be completed after 9 days of construction. How many days will the task be completed ahead of schedule?

30×45%= 13.5 days

30÷( 13.5÷9)

=30÷ 1.5

=20 days

30-20= 10 days

52. How many grams of water do you need to add to make salt water with salt content of 5% with 20 grams of salt?

20/5% = 400g

400-20 = 380g

53. Xiaoming deposited 1500 yuan in the bank for a fixed period of 3 years. How much interest can he get at maturity?

1500×3×5.4%

=4500×5.4%

=243 (yuan)

54. It takes 6 hours for Party A and Party B to process 1 batch of parts at the same time. When finished, Party A will do 20% more than Party B. How many hours will it take for Party B to do it alone?

Suppose the completion quantity of B is X, then the completion quantity of A is (1+20%) X.

X+( 1+20%)X= 1

X=5/ 1 1

6 ÷ 5/11=13.2 hours

55. Take 2500 grams of rice, and after drying, there is 1284 grams left, so as to find the drying rate of rice.

Drying rate:1284/2500×100% = 51.36%.

56. The price of a blue cat coat after 4% reduction is the same as that of a pair of blue cat sports shoes after 20% increase, both of which are in 96 yuan. How much is the original price of the blue cat coat and sneakers?

Solution: set of blue cat coat x yuan.

0.96X=96

X= 100

Solution: Y set of blue cat sneakers.

1.2Y=96

Y=80

57. The garment factory planned to produce 2,000 sets of children's clothes in September, and as a result, it completed 55% of the planned output in the first half of the month and the same number in the second half. How many sets were actually overproduced in September?

2000×55%= 1 100 sets.

1100+1100 = 2200 sets.

2200-2000 = 200 sets

58. The Agricultural Machinery Factory produced 1500 seeders last year, 300 more than planned. What is the percentage of exceeding the plan?

1500-300= 1200 units

300÷ 1200=25%

59. The length of a thick candle is the same as that of a thin candle. Thick candles can be lit for 5 hours, and thin candles can be lit for 4 hours. If these two candles are lit at the same time, after a period of time, the remaining thick candle is four times as long as the thin candle. How long have these two candles been lit?

Solution: let the ignition time be x.

1-x× 1/5 = 4×[ 1-x× 1/4]

x= 15/4

60. For a three-digit number, the number in the tenth digit is 3 larger than the number in the first digit and 1 smaller than the number in the hundredth digit, and the sum of the three digits is 50 times smaller than the three digits. Find this three-digit number

Solution: let x be in the tenth place, X-3 in the first place, and X+ 1 in the hundredth place.

(X+X-3+X+ 1)×50 = 100×(X+ 1)+ 10X+(X-3)-2

X=5

5-3=2

5+ 1=6

A: This three-digit number is: 652.

6 1. A TV factory produces 500 TV sets every day. In the quality appraisal, each qualified TV set will be deducted 5 points, and each unqualified TV set will be deducted 18 points. If you get 993 1 minute in four days, how many qualified TV sets have been produced in these four days?

500×5=2500 (minimum)

2500×4= 10000 (minutes)

(10000-9931) ÷ (18+5) = 3 (pieces)

500×4-3= 1997 (unit)

62. Mother squirrel can pick 20 pinecones every day in sunny days, and can only pick 10 in rainy days. It picked 120 pinecones for several days, with an average of 12 pinecones per day. How many rainy days are there these days?

120/ 12 = 10 (days)

20× 10=200 (piece)

(200-120) ÷ (20-10) = 8 (days)

63. There are two barrels of oil. The weight of barrel A is 0.2 times that of barrel 65438+B. If you pour 5 kilograms of oil into barrel B, the two barrels of oil are equally heavy. How many kilograms are there in two barrels of oil?

Let b x, a1.2x.

1.2x=x+5

x=25

A: 25× 1.2=30.

64. There are 80 chickens and rabbits, and chickens have 52 more feet than rabbits. How many chickens and rabbits are there?

Rabbit: 52(4-2)= 26 (only)

Chicken: 80-26=54 (only)

65. There are apples and pear trees, with apple trees accounting for 3/5 of the total and pear trees accounting for 180. How many trees are there?

180( 1-3/5)= 300 trees.

66. The per capita freshwater resources in the world are 9,200 cubic meters, and the per capita freshwater resources in China are 3/4 higher than those in the world. How many cubic meters of fresh water does China have per capita?

9200×3/4=6900 cubic meters

67. At present, the price of oil in the international market is about $70 per barrel, which is about 1/6 higher than a year ago. What was the price of a barrel of oil a year ago?

70÷( 1+ 1/6)=60 dollars.

68. The school wants to plant 120 saplings, and has completed all the tasks of grade 513. The remaining tasks are assigned to Class 1 and Class 2 of Grade 6 according to the ratio of 2: 3. How many saplings will these two classes plant?

120-120×1/3 = 80 trees.

1-2/5=3/5

Class 6 1: 80×2/5=32 trees.

Class 62: 80×3/5=48 trees.

National data show that water prices are rising every year. At present, the water price is about one ton of 3 yuan, and it is estimated that the water price will rise to one ton of 7 yuan in 20 10 years. It is estimated that after 20 10, what percentage will the water price increase?

(7-3)÷3= 133.3%

70. Uncle Wang's one-time labor remuneration income is 4,500 yuan, and the part after deducting 2,000 yuan according to the regulations is subject to personal income tax at the rate of 20%. How much personal income tax should he pay?

(4500-2000)×20%=500 yuan.

7 1, a cubic water tank, each side is 4 cm long, containing a box of water. If you pour this box of water into another rectangular water tank with a length of 0.8 meters and a width of 25 centimeters, what is the water depth?

0.8m = 80cm

4×4= 16 (length) = 16000 (ml)

80×25=2000 (square centimeter)

16000÷2000=8 cm

72. Aunt Li bought a house with a total price of 300,000 yuan, and she had to pay 1.5% of the house deed tax. How much deed tax should she pay?

30× 1.5%=0.45 (ten thousand yuan) =4500 (yuan)

73. Selling stocks in the stock market is called stamp duty according to the number of transactions. Uncle Wang bought 40,000 yuan of stock and paid stamp duty. What is the stamp duty rate in 80 yuan?

80÷40000=2%

74. Uncle Zhao opens a shop and pays business tax at 5% of the turnover. One month, Uncle Zhao will pay taxes around 950 yuan. What is Uncle Zhao's turnover this month?

950÷5%= 19000 (yuan)

75. Xiaoming practices shooting. He fired 520 bullets at a single shot. How many rounds did he fire (80% hit rate)? How many bullets missed the target?

520×80%=4 16 (hair) 500-4 16= 104 (hair)

76. In charitable donation activities, bright primary school donated 180 yuan in the fourth grade, which was 25% less than that in the fifth grade. How much did you donate in the fifth grade?

180( 1-25%)= 240 (yuan)

77. Two workshops 150 people. If 50 people are transferred from the first workshop, the number of people in the first workshop is 2/3 of that in the second workshop. How many people are there in workshop 2?

2÷(2+3)=2/5

100-2/5× (150-50) = 60 (person)

Shi Jing practices long-distance running every morning. She ran 5000 meters yesterday and 6000 meters today. I know I ran five minutes less yesterday than today. How many minutes did I run in two days?

6000-5000 =1000m

5÷ 1000/5000=25 points

5/ 1000/6000 = 30 points

A: History was 25 minutes yesterday and 30 minutes today.

79. Wang Jue walks every night, walking for 30 minutes last night and 25 minutes the night before; I also know that I walked 350 meters more last night than the night before. How many meters did I walk in two days?

350× [(30+25) ÷ (30-25)] = 3850m

80. The price of three pens and 12 ballpoint pen is the same. A pen is more expensive than a ballpoint pen. What is the unit price of each pen?

3.6×3÷( 12-3)= 1.2 (yuan)

1.2+3.6 = 4.8 (yuan)

A: Every pen is 4.8 yuan, every ballpoint pen 1.2 yuan.

8 1, there are 4 bags of soybeans and 7 bags of black beans, each bag has the same net weight, and soybeans are 540 kg less than black beans. If the oil yield of two kinds of beans is 12.5%, how many Jin of oil can be squeezed out?

540× [(7+4) ÷ (7-4) ]×12.5% = 247.5 (kg)

82. For two families who store potatoes, in winter, family A stores five cellars and family B stores three cellars. The reserves of each kiln of the two households are equal, and the storage of household A is 40,000 kilograms more than that of household B; When it is sold during the Spring Festival, it will naturally consume 3%. How many kilograms are left in each household?

40000 ÷ (5-3) × 5 × (1-3%) = 97000 (kg)

40000 ÷ (5-3) × 3 × (1-3%) = 58200 (kg)

A: There are 97,000 Jin left in household A and 58,200 Jin left in household B..

82. The circumference of a circle is 12.56 meters. How many square meters is its area?

12.56 ÷ 3.14 ÷ 2 = 2m.

2? ×3. 14= 12.56 m2

2. Xiaoming has 15 story books, which is 2 times less than Xiaohua's story books. How many story books does Xiaohua have?

15× 2-3 = 27 (Ben)

83. The circumference of the circular garden is 50.24 meters, and one eighth of the area is reserved for planting chrysanthemums. How big is the area of chrysanthemum?

50.24 ÷ 3.14 ÷ 2 = 8m

8? ×3. 14÷8=25. 12 (m2)

84. There is a rectangular open space with a length of 10 m and a width of 8 m in the campus. What is the maximum area of the largest round flower drawn in the center of this circle?

8÷2=4 (meters)

4? ×3. 14=50.24 square meters

85. The circumference of a square is equal to the circumference of a circle. It is known that the side length of a square is 3.14cm. What is the area of this circle?

3. 14×4÷3. 14÷2=2 (cm)

2? ×3. 14= 12.56 (square centimeter)

86. The outer diameter of a bicycle is 0.7 meters. If the wheel turns 90 times per minute on average, how far can it go in 40 minutes How many points does it take to cross a 567-meter bridge?

0.7×3. 14=2. 198 (m)

2.198× 90× 40 = 7912.8 (m)

567÷2. 198÷90≈3 (minutes)

A: 40 minutes is 79 12.8 meters, and it takes about 3 minutes to cross a 567-meter bridge.

87. The cross-sectional radius of two round bars is 7.5 cm. The two round bars are tightly tied together with a rope. How long is this rope at least, excluding the joint?

7.5×2= 15 (cm)

7.5×2×3. 14=47. 1 (cm)

15+47.1= 62.1(cm)

88. A car consumes 4/5 kilograms of fuel per line for 8 kilometers. How many kilometers is the average feasible per kilogram of gasoline? How many kilograms does driving 1 km consume?

8÷4/5= 10 (km/)

4/5÷8=0. 1 (kg)

89. After water becomes ice, its volume is110,2.16 cubic meters of ice melts into water, what is its volume?

2.16÷ (1+11) =1.98 (m3)

90. Xiaoming read a book and read part of it in the morning. At this time, the ratio of read pages to unread pages is1:9; Read six more pages in the afternoon than in the morning. At this point, the ratio of read pages to unread pages becomes 1: 3. How many pages are there in this book?

1÷( 1+9)= 1/ 10

1÷( 1+3)= 1/4

1/4- 1/ 10=3/20

6÷3/20=40 (page)