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Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

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Re: If x and y are integers, what is the value of y ? [#permalink]

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07 Jan 2014, 11:04

1

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If x and y are integers, what is the value of y ? (1) xy = 27 (2) x = y^2

St1: we have multiple values of y possible from 1 to 27 to -27...many options St2:not sufficient Combining we get that y^3=27 and since y is an integer so y=3

And C

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Re: If x and y are integers, what is the value of y ? [#permalink]

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05 Nov 2015, 09:38

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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.

If x and y are integers, what is the value of y ?

(1) xy = 27 (2) x = y^2

There are 2 variables (x,y) and 2 equations are given from the 2 conditions, so there is high chance (C) will be our answer. If we look at the conditions together, we get x=9, y=3, so the conditions are sufficient and the answer becomes (C).

For cases where we need 2 more equation, such as original conditions with “2 variables”, or “3 variables and 1 equation”, or “4 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 70% chance that C is the answer, while E has 25% chance. These two are the majority. In case of common mistake type 3,4, the answer may be from A, B or D but there is only 5% chance. Since C is most likely to be the answer using 1) and 2) separately according to DS definition (It saves us time). Obviously there may be cases where the answer is A, B, D or E.
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