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If the average of three numbers is V. If one of the numbers

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If the average of three numbers is V. If one of the numbers [#permalink] New post 08 Oct 2009, 14:20
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A
B
C
D
E

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100% (01:31) correct 0% (00:00) wrong based on 39 sessions
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If the average of three numbers is V. If one of the numbers is Z and another is Y, what is the remaining number?

A. ZY - V
B. Z/V - 3 - Y
C. Z/3 - V - Y
D. 3V- Z - Y
E. V- Z - Y
[Reveal] Spoiler: OA
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Re: Average of numbers [#permalink] New post 08 Oct 2009, 14:55
Expert's post
timmaxwell8 wrote:
1. If the average of three numbers is V. If one of the numbers is Z and another is Y, what is the remaining number?

A. ZY - V
B. Z/V - 3 - Y
C. Z/3 - V - Y
D. 3V- Z - Y
E. V- Z - Y


(Z+Y+X)/3=V --> Z+Y+X=3V --> X=3V-Z-Y

D.
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Re: Average of numbers [#permalink] New post 08 Oct 2009, 15:00
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V. If one of the numbers is Z and another is Y,

Let other number=n
(z+y+n)/3 = v
z+y+n=3v
n = 3v-z-y

ANS = D
Re: Average of numbers   [#permalink] 08 Oct 2009, 15:00
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