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

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The average score on a test taken by 10 students was X. If [#permalink] New post 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!
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Re: Average w/variables question [#permalink] New post 28 Dec 2008, 14:19
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(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
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Joined: 03 Dec 2007
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Re: Average w/variables question [#permalink] New post 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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The average score on a test taken by 10 students was X. If

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