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28 February, 04:56

One third of a number is 12 less than the number itself

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  1. 28 February, 05:02
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    Let "n" be a substitute for "a number"

    1/3 (n) = n-12 Multiply by 3

    n=3n-36 Get n onto the same side of the equation

    2n=36 Divide by 2

    n=18
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