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# The average score on a test taken by 10 students was X. If

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Current Student
Joined: 03 Dec 2007
Posts: 84
Schools: NYU STERN
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The average score on a test taken by 10 students was X. If [#permalink]  28 Dec 2008, 14:08
The average score on a test taken by 10 students was X. If the average score for 5 of the students was 8, what was the average score, in terms of x, for the remaining 5 students who took the test?

FYI - answer is 2x-8, but I am having a mental block right now!

THANKS!
VP
Joined: 05 Jul 2008
Posts: 1433
Followers: 35

Kudos [?]: 254 [1] , given: 1

Re: Average w/variables question [#permalink]  28 Dec 2008, 14:19
1
KUDOS
(X1 + X2 + X3 +.. X10) / 10 = X means (X1+X2+X3+.. +X10) = 10x

similarly (X1+X2+.. +X5) /5=8 means (X1+X2+.. +X5) =40

(X6 + .. X10) = 10x-40

Avg = 10x-40/5 = 2x-8
Current Student
Joined: 03 Dec 2007
Posts: 84
Schools: NYU STERN
Followers: 3

Kudos [?]: 6 [0], given: 0

Re: Average w/variables question [#permalink]  28 Dec 2008, 14:38
Duh thanks! That wasn't hard but I just completely spaced out!

THANK YOU!
Re: Average w/variables question   [#permalink] 28 Dec 2008, 14:38
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