Posted by **tori** on Monday, May 9, 2011 at 6:21pm.

i am a 3 digit number divisible by 3.my tens digit is 3 times as great as my hundreds digit and the sum of my digits is 15. if you reverse my digits i am divisible by 6 and 3...... what number am i?

- math -
**MathMate**, Monday, May 9, 2011 at 6:38pm
We know that the number is divisible by three if the sum of its digits is 15!

It's got 3 digits. When reversed, it is divisible by 6, which means that the reversed number is divisible by 2. This translates to

"the hundred's digit is even".

From

"my tens digit is 3 times as great as my hundreds digit"

we deduce that the number must be one of the three possibilities:

A. 13X

B. 26X

C. 39X

Where X can be found from the fact that the digits add up to 15.

Both A and C will not work because the hundreds digit is not even.

So can you find the number now?

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