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The weight of 72 books. is 9 kg.
@ Find the weight of 80 such books.
(b) How many books will weigh 6 kg?
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Step-by-step explanation:
find weight of 1 book
9kg=9000gm
weight of 1 book=9000/72=125gm
weight of 80 books=80×125=10000gm=10kg
in 60 kg there will be 6000/125 =50
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