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23 November, 20:33

15 more than half a number is 9

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  1. 23 November, 20:53
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    The number is 'N'.

    Half of the number is (1/2 N).

    15 more than that is (1/2 N + 15)

    Now, you said that 1/2 N + 15 = 9

    Subtract 15 from each side: 1/2 N = - 6

    Multiply each side by 2 : N = - 12
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