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# If a + b = 8c, what is the average (arithmetic mean) of a,

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Joined: 29 Jan 2005
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If a + b = 8c, what is the average (arithmetic mean) of a, [#permalink]

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02 Oct 2005, 01:43
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If a + b = 8c, what is the average (arithmetic mean) of a, b, and c, in terms of c?

A. 8c + 2
B. 7c/3
C. c
D. 3c
E. c/3
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Joined: 13 Jun 2004
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Schools: Tuck'08
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02 Oct 2005, 04:07
no need to repeat the clear explanation from Richardj
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03 Oct 2005, 12:12
mean = (a+b+c)/3
a+b = 8c
(8c + c)/3 = 9c/3
= 3c
03 Oct 2005, 12:12
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