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3 February, 19:23

The product of a number and 9 less than the number is 90. find the number.

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  1. 3 February, 19:33
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    Factors of 36 that differ by 9 are 12 and 3;

    12*3 = 36

    Or you could write x (x - 9) - 36 = (x - 12) (x + 3) = 0

    The number was 12
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