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Re: The figure above shows two entries, indicated by m and n, in [#permalink]

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10 Jan 2014, 20:45

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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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.

The figure above shows two entries, indicated by m and n, in an addition table. What is the value of n + m?

(1) d + y = -3 (2) e + z = 12

When you modify the original condition and the question, n+m=(e+y)+(d+z)=(e+z)+(y+d)=?. Then you need all 1) & 2) and therefore the answer is C.

Once we modify the original condition and the question according to the variable approach method 1, we can solve approximately 30% of DS questions.
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The figure above shows two entries, indicated by m and n, in [#permalink]

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03 Nov 2016, 13:42

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marcodonzelli wrote:

The figure above shows two entries, indicated by m and n, in an addition table. What is the value of n + m?

(1) d + y = -3 (2) e + z = 12

Target question:What is the value of n + m? Notice that the table tells us that m = d + z and that n = e + y So, m + n = (d + z) + (e + y) So we can REPHRASE the target question... REPHRASED target question:What is the value of d + z + e + y?

Statement 1: d + y = -3 This information provides only half of the information we need. We still need the values of z and e in order to find the sum of d + z + e + y Since we cannot answer the REPHRASED target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: e + z = 12 This information provides only half of the information we need. We still need the values of d and y in order to find the sum of d + z + e + y Since we cannot answer the REPHRASED target question with certainty, statement 2 is NOT SUFFICIENT

Statements 1 and 2 combined Statement 1 tells us that d + y = -3 Statement 2 tells us that e + z = 12 So, d + z + e + y = (d + y) + (e + z) = (-3) + (12) = 9 Since we can answer the REPHRASED target question with certainty, the combined statements are SUFFICIENT

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