How many games did they win?

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Mclaughlin: Master | Next Rank: 500 Posts; Posts: 131; Joined: Mon May 05, 2008 10:46 am; Thanked: 1 times

by Mclaughlin » Sun Aug 03, 2008 11:18 am

Before play-offs, a certain team had won 80 percent of its games. After play-offs, what percent of all its games had the team won?
(1) The team competed in 4 play-off games.
(2) The team won all of its play-off games.

OA is E

not sure why it's E. I put C.

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Source: Beat The GMAT — Data Sufficiency | Sun Aug 03, 2008 11:18 am

newera: Senior | Next Rank: 100 Posts; Posts: 82; Joined: Wed Jun 18, 2008 4:26 pm; Thanked: 10 times

by newera » Sun Aug 03, 2008 12:22 pm

Its E because we never find out how many games they competed in before playoffs. We are just told that 80% are won. Since we don't have the pre-playoff game total, we won't be able to figure out the total number of all games (pre-playoff + post-playoff) unless its given to us. And its not. We would then be trying to solve for three different things...a) pre-playoff game count, b) total game count, c) percent of that total amount.

So the answer is E.

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