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10-11-2016
Mathematics

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

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11-11-2016

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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