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30 July, 14:20

The sum of the digits of a three-digit number is 6. The hundreds digit is twice the units digit, and the tens digit equals to the sum of the other two. Find the number.

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  1. 30 July, 14:39
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    A+b+c=6, a=2c, b=a+c using a and b in the first equation gives you:

    2c+a+c+c=6 now use a=2c again

    2c+2c+c+c=6

    6c=6

    c=1, since a=2c

    a=2, since b=a+c

    b=3

    So the number is 231.
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