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The weight of 72 books is 9 kg what is the weight of 40 such books?

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The weight of 72 books is 9 kg what is the weight of 40 such books? 

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The weight of 72 books = 9 kg 

The weight of 1 book = 9/72  = 1/8 

The weight of 40 books = 1/8 x 40 = 5 kg 

Thus, the weight of 40 books is 5 kg

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