Mathematical problems related to Valentine's Day

Math problems related to Valentine's Day, such as:

There is a soap that can be made into the shape of a rose. After making a rose, there are about 15 petals. Xiaoming wants to buy 20 such roses for his girlfriend, because she can meet him around June this year, that is, 2065,438+07. Q: After my girlfriend gets 20 roses, how many petals will she need to use in June? (The answer should be kept to two decimal places)

According to the end of June, February 14 to the end of June is14+31+30+3136 days, with 20 flowers * * * with 15×20=300 petals.

300÷ 136=2.2 1。