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Earlier average of a game played is 869. You played 10 games

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Earlier average of a game played is 869. You played 10 games [#permalink] New post 27 Apr 2007, 10:15
Earlier average of a game played is 869. You played 10 games and the current average is 855. What is your 10 game average?
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 [#permalink] New post 27 Apr 2007, 10:46
864.6 provided the game was only played once before the 10 recent games. If thats true, then it easy. Do this:
(869 + 10x)/11 = 865

If there were more than 1 game played then we have insufficient information.

This would make for a good DS question or a deadly PS question if the answer choices included 864.6 & None of the above.
  [#permalink] 27 Apr 2007, 10:46
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Earlier average of a game played is 869. You played 10 games

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