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

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by VJesus12 » Sat Aug 25, 2018 1:55 am

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Answers

A

B

C

D

E

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Difficulty—

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

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

The OA is the option D.

Why is D? How can I sum all the numbers? Is there an easy way? Please, help me.

Source: Manhattan GMAT
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by Brent@GMATPrepNow » Sat Aug 25, 2018 5:25 am
VJesus12 wrote:Image

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

A. 0
B. 300
C. 500
D. 1500
E. 6500
Always check the answer choices BEFORE solving the question!!
Since the answer choices are nicely spread apart, we can be quite aggressive in our estimation

Let's add the 5 numbers in each COLUMN

COLUMN 1: Sum ≈500
COLUMN 2: Sum ≈-1000
COLUMN 3: Sum ≈1500
COLUMN 4: Sum ≈-2000
COLUMN 5: Sum ≈2500

TOTAL SUM ≈500 + (-1000) + 1500 + (-2000) + 2500
≈1500

Answer: D

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Brent
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by Scott@TargetTestPrep » Sat Apr 13, 2019 6:01 pm
VJesus12 wrote:Image

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

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

The OA is the option D.

Why is D? How can I sum all the numbers? Is there an easy way? Please, help me.

Source: Manhattan GMAT
We don't have actually add up all the numbers; we can just approximate the sum. Let's add the numbers column by column.

We see that the 5 numbers in the first column are each about 100, so the sum is approximately 500. The 5 numbers in the second column are each about -200, so the sum is approximately -1000. The 5 numbers in the third column are each about 300, so the sum is approximately 1500. The 5 numbers in the fourth column are each about -400, so the sum is approximately -2000. Lastly, the 5 numbers in the fifth column are each about 500, so the sum is approximately 2500.

Therefore, the sum of all 25 numbers is approximately 500 + (-1000) + 1500 + (-2000) + 2500 = 4500 - 3000 = 1500

Answer: D.

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