A pile of 180 identical books weights 80 kg. Find
(a) how many books weigh 20 kg?
(b) the weight of 135 books.
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Weight of 180 books=80kg
Weight of 1 book=80/180=4/9
a) Weight= 20 kg
Let books = x
No. of books that weight 20 kg-
x*4/9=20
x=20*9/4
x=45 books
b)Weight of 135 books = x
No. of books = 135
=135*4/9
=15 kg
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