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Two different teams, X and Y, which have no members in

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Two different teams, X and Y, which have no members in [#permalink] New post 22 Mar 2011, 06:55
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66% (02:08) correct 33% (01:46) wrong based on 0 sessions
Two different teams, X and Y, which have no members in common, will merge to form a new team. If the average (arithmetic mean) height of the players on team X is 5 feet 7 inches and the average height of the players on team Y is 5 feet 10 inches, which team has more players?

(1) If a new team, team Z, is formed from teams X and Y it will have an average height of 5 feet 9 inches.
(2) There are 12 players on team X.
[Reveal] Spoiler: OA

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Re: average ds [#permalink] New post 22 Mar 2011, 07:04
The answer is A.

(1) gives us how a weighed average, that can be derived from the height of players in X and Y teams, is nearer to Y, so Y has more players.

(2) does not give any information about number of players in team Y, so not sufficient.
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Re: average ds   [#permalink] 22 Mar 2011, 07:04
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