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What is the average (arithmetic mean) of a, b, and c? (1)

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What is the average (arithmetic mean) of a, b, and c? (1) [#permalink] New post 05 Dec 2005, 22:21
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What is the average (arithmetic mean) of a, b, and c?

(1) The sum of 2a, 2b, and 2c is 30.
(2) The average (arithmetic mean) of a + 3, b ・2, c ・4 is 4.

I can`t seem to understand why statement (2) is correct.
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Re: DS Mean [#permalink] New post 05 Dec 2005, 23:05
GMATT73 wrote:
What is the average (arithmetic mean) of a, b, and c?

(1) The sum of 2a, 2b, and 2c is 30.
(2) The average (arithmetic mean) of a + 3, b ・2, c ・4 is 4.

is (2) [(a + 3) + 2b + 4c]/3 = 4? if so, then clearly it is A only.
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 [#permalink] New post 05 Dec 2005, 23:46
That was my understanding as well. But the OA says that B is also a solution. :?
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Re: DS Mean [#permalink] New post 06 Dec 2005, 00:04
I do not think that B is sufficient.
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 [#permalink] New post 06 Dec 2005, 00:06
Thanx guys! I think I`ll trash this source! :evil:
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 [#permalink] New post 06 Dec 2005, 00:27
B couldn't possibly be the answer!
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 [#permalink] New post 06 Dec 2005, 08:30
GMATT73 wrote:
Thanx guys! I think I`ll trash this source! :evil:

800 score level judgement. these kinds of sources must be trashed. :P
  [#permalink] 06 Dec 2005, 08:30
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