find a 3 digit number whose sum is 12 times greater than its number
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4
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Well, aa can't be very big.... In fact, it's easy to see that 12(a+b+c)≤12⋅27=32412(a+b+c)≤12⋅27=324. So that's already extremely restrictive.
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0
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sorry I didn't get the point (×__×)
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