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2015-05-07T15:49:13+05:30

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72 books = 9 kg
then 1 kg = 72/ 9 
1 kg = 8 books 
40 /8 
5 kg is the answer
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2015-05-07T15:51:15+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Weight of 72 books = 9 Kg
So, weight of 1 book = 9/72 kg = 0.125 Kg
Hence, weight of 40 books = 0.125*40 kg  = 5 Kg

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