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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 B: Substitution (Plugging in)

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Posted: 09/05/2012 23:53
I do t get how it says
one third of the digit ....
Arcadia
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Replies to This Thread: 1 | ----
 
Posted: 09/07/2012 20:06
Aidet, here is how you set it up:

There are 2 digits in a number: x and y. x is the ten's part, and y is the unit part.
According to the information given:
x + y = 12
x = 1/3 * y

You have 2 equations with 2 unknowns, which should be easy to solve ...
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Reply 1 of 1
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Posted: 11/21/2012 10:49
Yes, in this case you get 4/3 y = 12, which yields y=9.
 
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The sum of the digits of a two-digit number is 12, and the ten’s ... ... 
Posted: 03/15/2015 11:37
Thx
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