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

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Current Student
Joined: 29 Jan 2005
Posts: 5218
What is the average (arithmetic mean) of a, b, and c? (1) [#permalink]

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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 cant seem to understand why statement (2) is correct.
SVP
Joined: 05 Apr 2005
Posts: 1710

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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.
Current Student
Joined: 29 Jan 2005
Posts: 5218

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05 Dec 2005, 23:46
That was my understanding as well. But the OA says that B is also a solution.
Director
Joined: 14 Sep 2005
Posts: 985
Location: South Korea

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06 Dec 2005, 00:04
I do not think that B is sufficient.
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Auge um Auge, Zahn um Zahn !

Current Student
Joined: 29 Jan 2005
Posts: 5218

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06 Dec 2005, 00:06
Thanx guys! I think Ill trash this source!
VP
Joined: 06 Jun 2004
Posts: 1053
Location: CA

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06 Dec 2005, 00:27
B couldn't possibly be the answer!
SVP
Joined: 05 Apr 2005
Posts: 1710

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06 Dec 2005, 08:30
GMATT73 wrote:
Thanx guys! I think I`ll trash this source!

800 score level judgement. these kinds of sources must be trashed.
06 Dec 2005, 08:30
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