Question

The weight of 72books is 9 kg. find the weight is 1 book.
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Answer 1

Answer:

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Answer 2

$72 \: \: books = 9 kg. \\ \\ hence \\ \\ 1 \: \: \: book \: = \: \: \frac{9}{72} \\ \\ 1 \: \: book = \frac{1}{8} \\ \\ 1 \: \: book = 0.125$