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On a given day, 50 students in a certain class took a math

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Current Student
Joined: 11 May 2008
Posts: 555

Kudos [?]: 216 [0], given: 0

On a given day, 50 students in a certain class took a math [#permalink]

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22 Jul 2008, 19:17
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

On a given day, 50 students in a certain class took a math test. Some of the students w took the test on test paper A, and the remaining of the 50 students took the test on test paper B. What is the average score on the test for the 50 students?
(1) The average score for the students who take the test A was 75.
(2) The average score for the students who take the test B was 77.

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Manager
Joined: 05 Jul 2008
Posts: 136

Kudos [?]: 123 [0], given: 40

GMAT 2: 740 Q51 V38

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22 Jul 2008, 21:21
arjtryarjtry wrote:
On a given day, 50 students in a certain class took a math test. Some of the students w took the test on test paper A, and the remaining of the 50 students took the test on test paper B. What is the average score on the test for the 50 students?
(1) The average score for the students who take the test A was 75.
(2) The average score for the students who take the test B was 77.

I think it's E coz we don't have the number of students taking each paper test.

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Senior Manager
Joined: 28 Feb 2007
Posts: 300

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22 Jul 2008, 21:42
E.
X- #of stu. who took test A.
(50-X ) is the # of stu. for test B.

1) 75X insuff.
2) 77(50-x) insuff

1+2) (77*50-2x)/50 X=? Insuff.

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SVP
Joined: 28 Dec 2005
Posts: 1549

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23 Jul 2008, 04:57
E, as we dont know the breakdown of how many students took test A vs test B

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Re: average marks   [#permalink] 23 Jul 2008, 04:57
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