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The sum of the digits of a two-digit number is 12, and the ten’s ... ...

The sum of the digits of a two-digit number is 12, and the ten’s digit is one-third the unit’s digit. What is the number?
(A)    93
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set C: Substitution (Plugging In)

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Posted: 07/27/2012 11:22
When they say "the unit's digit" are they talking about the actual number? Like for 93 the unit's digit is 93.
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Posted: 07/27/2012 12:30
Katie, yes.
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The sum of the digits of a two-digit number is 12, and the ten’s ... ... 
Posted: 12/01/2015 20:38
What is meant by the tens digit is one third the units digit. Wouldn't one third of 39 by 13?
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Posted: 12/01/2015 20:46
Hi Joelene,

It's the ten's digit that is one-third (of something), not the whole number. The ten's digit of 39 is 3, and the unit's digit of 39 is 9. And 3 = 9/3, so the answer is D.

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