The figure above shows two entries, indicated by m and n, in : GMAT Data Sufficiency (DS)
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# The figure above shows two entries, indicated by m and n, in

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20 Jan 2008, 02:18
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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
[Reveal] Spoiler: OA

Last edited by Bunuel on 11 Jan 2014, 04:10, edited 1 time in total.
Renamed the topic, edited the question, added the OA and moved to DS forum.
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20 Jan 2008, 02:43
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C

Information from table:
d+z=m (1)
e+y=n (2)

need to find "m+n"

A: d+y=-3, INSUFF - no information about n
B: e+z=12, INSUFF - no information about m

Adding 1 and 2 (under information)

(d+y)+(e+z)=m+n=12-3=9 (use both A and B)
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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
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Re: The figure above shows two entries, indicated by m and n, in [#permalink]

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16 Nov 2014, 20:49
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Moderator: Bunuel

Please can you add a tag to this question as GMAT Prep Exam Pack 1.
Thxs,
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Re: The figure above shows two entries, indicated by m and n, in [#permalink]

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17 Nov 2014, 00:55
dmmk wrote:
Moderator: Bunuel

Please can you add a tag to this question as GMAT Prep Exam Pack 1.
Thxs,
Dmmk

_____________
Done. Thank you.
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Re: The figure above shows two entries, indicated by m and n, in [#permalink]

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01 Jan 2016, 18:25
There must be something I'm completely unaware of because how does box DY and box EZ relate to the box values the question asks for?
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Re: The figure above shows two entries, indicated by m and n, in [#permalink]

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03 Jan 2016, 09:49
Anonamy wrote:
There must be something I'm completely unaware of because how does box DY and box EZ relate to the box values the question asks for?

It's an an addition table. For example, e + y = n and d + z = m.

Hope it's clear.
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Re: The figure above shows two entries, indicated by m and n, in [#permalink]

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04 Jan 2016, 03:33
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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

[Reveal] Spoiler:
C

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The figure above shows two entries, indicated by m and n, in   [#permalink] 03 Nov 2016, 13:42
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