The weight of 72 books is 9 kg. What is the weight of 40 such book - in ratio and proportion method
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The weight of 40 books would be 5 kg.
1) Its given that Weight of 72 books is 9 kg.
2) Hence, weight of 1 book would be 9/72 kg = 1/8 kg
3) Weight of 40 books would be 1/8*40 kgs = 5 kgs
4) Hence we can similarly found the weight of any number of books
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