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

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If a + b = 8c, what is the average (arithmetic mean) of a, [#permalink] New post 02 Oct 2005, 00:43
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A
B
C
D
E

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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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 [#permalink] New post 02 Oct 2005, 03:07
same answer : D (3c)
no need to repeat the clear explanation from Richardj
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 [#permalink] New post 03 Oct 2005, 11:12
mean = (a+b+c)/3
a+b = 8c
(8c + c)/3 = 9c/3
= 3c
Answer is D
  [#permalink] 03 Oct 2005, 11:12
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If a + b = 8c, what is the average (arithmetic mean) of a,

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