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What is the sum of all 50 numbers in a list?

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What is the sum of all 50 numbers in a list? [#permalink]

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New post 04 Sep 2014, 16:53
1
4
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

84% (00:36) correct 16% (00:44) wrong based on 231 sessions

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What is the sum of all 50 numbers in a list?

(1) The sum of positive numbers in the list 7.3
(2) The sum of negative numbers in the list is 10.6 less than the sum of the positive numbers.

Please read the spoiler below to understand my doubt.

OA is C.
I know this is a official exercise from GMAC and is probably right, but for me the answer is E. The statements do not give any information about neutral numbers (zeros)
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Re: What is the sum of all 50 numbers in a list? [#permalink]

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New post 04 Sep 2014, 17:05
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1
brunora wrote:
What is the sum of all 50 numbers in a list?

(1) The sum of positive numbers in the list 7.3
(2) The sum of negative numbers in the list is 10.6 less than the sum of the positive numbers.

Please read the spoiler below to understand my doubt.

OA is C.
I know this is a official exercise from GMAC and is probably right, but for me the answer is E. The statements do not give any information about neutral numbers (zeros)


The question asks about the sum of the numbers in a list. When we combine the statements we get that the sum of positive numbers in the list 7.3 and the sum of negative numbers in the list is 7.3 - 10.6 = -3.3. So, the sum of all numbers is 7.3 + (-3.3) = 4.

Answer: C.

As for your doubt: what difference would it make whether we have a few zeros in the list? How would it affect the total sum? Even if there are zeros in the list their sum is 0, no?
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Re: What is the sum of all 50 numbers in a list? [#permalink]

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New post 02 Dec 2014, 20:42
1
1. we do not know +number or other numbers are all zero so not sufficient.
2. same confusion. not sufficient.

1&2. we know positive and negative we can ignore zeros as they do not contribute to sums. Sufficient.

Answer: C


brunora wrote:
What is the sum of all 50 numbers in a list?

(1) The sum of positive numbers in the list 7.3
(2) The sum of negative numbers in the list is 10.6 less than the sum of the positive numbers.

Please read the spoiler below to understand my doubt.

OA is C.
I know this is a official exercise from GMAC and is probably right, but for me the answer is E. The statements do not give any information about neutral numbers (zeros)

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What is the sum of all 50 numbers in a list? [#permalink]

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New post 23 Dec 2014, 22:49
brunora wrote:
What is the sum of all 50 numbers in a list?

(1) The sum of positive numbers in the list 7.3
(2) The sum of negative numbers in the list is 10.6 less than the sum of the positive numbers.

Please read the spoiler below to understand my doubt.

OA is C.
I know this is a official exercise from GMAC and is probably right, but for me the answer is E. The statements do not give any information about neutral numbers (zeros)


Both the statements are individually insufficient, as they keep several probabilities open. Combining them gives an easy choice, so C is correct. Zeroes add neither to +ve nor -ve side so they don't matter.

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Re: What is the sum of all 50 numbers in a list? [#permalink]

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New post 19 Jan 2018, 18:42
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Re: What is the sum of all 50 numbers in a list?   [#permalink] 19 Jan 2018, 18:42
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