Answers

2016-01-13T20:04:58+08:00
389 is the answer as you requested!


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2016-01-13T20:51:26+08:00
let x = unit's digit
3x = hundred digit
3x - 1 = tens digit

x + 3x + 3x - 1 = 20
7x = 20 + 1
 \frac{7x}{7} = \frac{21}{7}
x = 3 - unit's digit
3x = 3(3) = 9 - hundreds digit
3x - 1 = 3(3) - 1 = 8 - tens digit

Therefore, the answer to your question is 983.
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