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8 February, 18:22

After Khalil gave Benjamin 3/5 of the rocks in his collection, Benjamin had 70 rocks. If Benjamin had 25 rocks in the beginning, how many rocks did Khalil have in the beginning?

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  1. 8 February, 18:43
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    Benjamin had 25 rocks in the beginning ... 70 - 25 = 45

    so 3/5 of Khalil's rocks are 45 rocks ...

    (3/5) / 45 = 1/x

    cross multiply

    3/5x = 45

    x = 45 * 5/3

    x = 225/3

    x = 75 < = = khalil had 75 rocks to begin with
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