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What is the sum of all of the integers in the chart above?

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What is the sum of all of the integers in the chart above? [#permalink] New post 15 Jan 2012, 15:10
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75% (03:18) correct 25% (01:57) wrong based on 0 sessions
Guys - please see attached. can you please let me know what is the underlying concept behind to solve this and what will be the answer? I don't have an OA unfortunately.

Attachment:
111.JPG
111.JPG [ 15.19 KiB | Viewed 685 times ]
What is the sum of all of the integers in the chart above?

A. 0
B. 300
C. 500
D. 1500
E. 6500
[Reveal] Spoiler: OA

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E.

MGMAT 1 --> 530
MGMAT 2--> 640
MGMAT 3 ---> 610 :-(


Last edited by Bunuel on 15 Jan 2012, 16:12, edited 3 times in total.
Edited the question and added the chart
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Re: Sum in the chart [#permalink] New post 15 Jan 2012, 15:26
What is the question that was asked?
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Re: Sum in the chart [#permalink] New post 15 Jan 2012, 15:27
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enigma123 wrote:
Guys - please see attached. can you please let me know what is the underlying concept behind to solve this and what will be the answer? I don't have an OA unfortunately.

What is the sum of all of the integers in the chart above?

A. 0
B. 300
C. 500
D. 1500
E. 6500


Reorder the numbers in columns in ascending absolute value:
Attachment:
untitled.JPG
untitled.JPG [ 15.23 KiB | Viewed 692 times ]
Now, it's easy to spot that the numbers in each column represent an equally spaced set (AP) and the sum in each can be found by mean*# of terms:

Sum=5*100+5*(-200)+5*(300)+5*(-400)+5*(500)=500-1,000+1,500-2,000+2,500=1,500.

Answer: D.
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Re: Sum in the chart [#permalink] New post 15 Jan 2012, 15:29
Sorry Bunuel. The question is What is the sum of all of the integers in the chart above?
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Re: Sum in the chart [#permalink] New post 15 Jan 2012, 15:39
enigma123 wrote:
Sorry Bunuel. The question is What is the sum of all of the integers in the chart above?


Yes, I guessed so and that's exactly the question I answered in my previous post.

P.S. Edited the question in your initial post and added the chart.
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PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!


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Re: Sum in the chart [#permalink] New post 15 Jan 2012, 15:42
Absolutely and many thanks. As always, thorough and a very helpful answer.
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E.

MGMAT 1 --> 530
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MGMAT 3 ---> 610 :-(

Re: Sum in the chart   [#permalink] 15 Jan 2012, 15:42
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