The school distributed 270 science and technology books to the sixth, seventh, eighth and sixth grades according to the ratio of 2: 3: 4. How many books have you got? How many copies did you get in seventh grade? eight 2+3+4=9

Grade 6: 270× 2/9 =60 (Ben)

Grade 7: 270× 3/9 =90 (Ben)

Grade 8: 270× 4/9 = 120 (Ben)

A: I have 60 books in grade six, 90 books in grade seven and 0/20 books in grade eight.

Note: How many nineties have I typed? You write in your way. Computer, I can't play. Only Chinese characters are used instead.