Weight of 72 books is 9 kg what is the weight of of 80 such books what is the how many such Books with 6 kg
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weight of 72 books = 9kg
weight of 1 book = 9/72
= 0.125 kg
weight of 80 books = 0.125*80
= 10 kg
now to find out number of books in 6 kg
1 book = 0.125
x book = 6 kg
we cross multiply
1 x 6 = 0.125 * x
x = 6/0.125
= 48 books
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