7. The weight of 72 books in 9kg (a)find the weight of 80 such books. (b) how many books will weight 6kg
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Answer:
According to the question,
Weight of 72 books = 9kg
Weight of 1 book = 9/72
= 1/8
= 0.125kg
= 125 grams
(a) Weight of 80 books = 80×125
= 10000 grams
= 10 kg.
(b) No. of books that weight 6 kg = 6/0.125
= 48 books
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