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

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Joined: 11 May 2008
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On a given day, 50 students in a certain class took a math [#permalink]  22 Jul 2008, 18:17
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.
Manager
Joined: 05 Jul 2008
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GMAT 2: 740 Q51 V38
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Re: average marks [#permalink]  22 Jul 2008, 20:21
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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Re: average marks [#permalink]  22 Jul 2008, 20:42
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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Re: average marks [#permalink]  23 Jul 2008, 03:57
E, as we dont know the breakdown of how many students took test A vs test B
Re: average marks   [#permalink] 23 Jul 2008, 03:57
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# On a given day, 50 students in a certain class took a math

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