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If m, n are positive integers, what is the value of mn?

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by Max@Math Revolution » Fri Jun 17, 2016 11:17 pm
If m, n are positive integers, what is the value of mn?
1) m/n=7/15
2) The greatest common divisor of m and n is 3
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Source: — Data Sufficiency |
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by Max@Math Revolution » Fri Jun 17, 2016 11:17 pm
There are 2 variables in the original condition. Hence, there is high chance that C is the correct answer. Using both the condition 1) and the condition 2), we get m=(7)(3) and n=(15)(3). Thus, the correct answer is C.

- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
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