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21 August, 07:54

The weight of 72 books is 9 kg. what is the weight of 80 such books? How many such books would weigh 6kg?

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  1. 21 August, 10:43
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    9 divided by 72 = 0.125

    0.125 is the weight of one book

    0.125 times 80 = 10kg.

    So 80 books weight 10kg.

    72 divided by 9 = 8 books make up 1 kg.

    8 times 6 = 48
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