In a bookstore ,60 identical books occupy a length of 1.5m on a shelf.Find the number of such books needed to completely occupy a shelf that is 80 cm long.

Answer 1

average width of a book = 150/60 cm = ....
then number of books for 80 cm = 80/width of book
or
just use a simple ratio
n/80 = 60/150 , solve for n , the number of books

Answer 2

Wrong answer

Answer 3

wrong ans