24 solar terms posted a press release.

Because: three pens in a book =8 pens. Xiao Ming's three pens and Xiao Hong's three pens cancel out, that is, a book =5 pens.

See 8 strokes =24 to post a picture, then 1 stroke =3 to post a picture.

A notebook =5 pens 1 pen =3 to post pictures.

3 times 15= 15 map.