The weight of 72 books is 9 kg.
What is the weight of 80 such books?

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Solution

Weight of $72$ books $= 9 k g$
Weight of $1$ book $= \frac{9}{72} k g$
Weight of $80$ books $= 80 \times \frac{9}{72} = 10 k g$
Hence, the weight of $80$ books is $10 k g .$

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