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Before play-offs, a certain team had won 80 percent of its games. Afte Updated on: 23 May 2022, 08:56
Originally posted by boomtangboy on 08 Apr 2012, 09:41.
Last edited by Bunuel on 23 May 2022, 08:56, edited 2 times in total.
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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.
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E
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Bunuel
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Before play-offs, a certain team had won 80 percent of its games. Afte 08 Apr 2012, 10:29
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boomtangboy
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.


What is being asked here? Before + After Play-offs ?
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The question asks about the percent of the total games that the team won.

For (1)+(2) we have that the team won 80% of games played before play-offs and 100% of 4 games played after. Now, without knowing how many games were played before play-offs we cannot answer the question.

For example if before play-offs the team played 5 games then it won 8 out of 9 games (4 before and 4 after) but if before play-offs the team played 10 games then it won 12 out of 14 games (8 before and 4 after).

Answer: E.
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Before play-offs, a certain team had won 80 percent of its games. Afte 10 Sep 2017, 10:52
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I couldn't understand the question, and option B. Could anyone please explain?
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Before play-offs, a certain team had won 80 percent of its games. Afte 10 Sep 2017, 21:29
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DAakash7
I couldn't understand the question, and option B. Could anyone please explain?
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The team played certain number of games before play-offs plus certain number of games in play-offs. We want to know what percent of all its games had the team won.

(2) says that the team won all of its play-off games.

Check complete solution here: https://gmatclub.com/forum/before-play- ... l#p1071527

Hope it helps.
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Before play-offs, a certain team had won 80 percent of its games. Afte 10 Sep 2017, 23:57
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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?
Let no. of games before playoff = x
Game wons = 80% of x = 0.8x

(1) The team competed in 4 play-off games.
so total no. of games = x+4. But here we don't know how many games team won. So we cannot calculate % of won games. So Not sufficient

(2) The team won all of its play-off games.
Team won all games. But we don't know how many games are being played. SO we don't know final total number of games. Not sufficient

1+2
Now we know team played 4 more games and won all
So total number of games = x+4
Total games won = 0.8x+4

% of games won = (0.8x +4) /(x+4) *100

Here we cannot solve equation as we don't know x and nothing cancels out. So Not sufficient.

Answer: E
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Before play-offs, a certain team had won 80 percent of its games. Afte 11 Sep 2017, 02:53
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DAakash7
I couldn't understand the question, and option B. Could anyone please explain?

The team played certain number of games before play-offs plus certain number of games in play-offs. We want to know what percent of all its games had the team won.

(2) says that the team won all of its play-off games.

Check complete solution here: https://gmatclub.com/forum/before-play- ... l#p1071527

Hope it helps.
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Thanks a lot for the clarification Bunuel - please accept my Kudos also.
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Before play-offs, a certain team had won 80 percent of its games. Afte 31 May 2022, 08:09
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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.
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Given: Before play-offs, a certain team had won 80 percent of its games

Target question: After play-offs, what percent of all its games had the team won?

Strategy: It's sometimes useful to ask ourselves why the target question is impossible to answer without any additional information.
In this case, we can't answer the target question because we don't know the total number of games played before the playoffs, and we don't know the total number of games played during the playoffs.
When I scan the two statements, I see that neither of them provide information about the total number of games played before the playoffs.
This leads me to believe that the statements combined are still not sufficient.
So, I’m going to head straight to……

Statements 1 and 2 combined
There are several scenarios that satisfy BOTH statements. Here are two:
Case a: The team played 5 games before the playoffs, which means they won 4 of those 5 games (i.e., 80%). Then the team won all 4 of its playoff games. In total, the team played 9 games and won 8 of them. So, the answer to the target question is the team won about 89% of its games

Case b: The team played 20 games before the playoffs, which means they won 16 of those 20 games (i.e., 80%). Then the team won all 4 of its playoff games. In total, the team played 24 games and won 20 of them. So, the answer to the target question is the team won about 83% of its games

Since we can’t answer the target question with certainty, the combined statements are NOT SUFFICIENT

Answer: E
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Before play-offs, a certain team had won 80 percent of its games. Afte 22 Feb 2025, 04:26
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If the team won all of its games after playoffs, can't we just take that as 100 percent of the games won and choose answer B? Can someone help me out?
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Before play-offs, a certain team had won 80 percent of its games. Afte 05 Aug 2025, 09:23
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If the team won all of its games after playoffs, can't we just take that as 100 percent of the games won and choose answer B? Can someone help me out?
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We're asked "After play-offs, what percent of all its games had the team won?" B gives you that 100% of the games were won after play offs, we need to find the overall percent of all games won, which would include (games won before playoffs + games won after playoffs)/total games played
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Before play-offs, a certain team had won 80 percent of its games. Afte 05 Aug 2025, 09:28
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KarishmaB can we solve this question using the concept of weighted average?
Before playoffs: 80%, number of games : unknown
To find overall percentage of games won, we need:
- Percentage of games won before playoffs (given, 80%)
- Total number of games played before playoffs (unknown)
- Percentage of games won after playoffs (unknown)
- Total number of games played after playoffs (unknown)

(1) The team competed in 4 play-off games.
This gives us the Total number of games played after playoffs, but two quanities are still unknown => Inusfficient

(2) The team won all of its play-off games.
This gives us the Percentage of games won after playoffs (100%), but two quanities still unkown => Insufficient

Combining the two, Total number of games played before playoffs is still unknown => (E)
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Before play-offs, a certain team had won 80 percent of its games. Afte 07 Aug 2025, 04:28
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Yes you can and you got it exactly right.

80% wins before playoffs and 100% wins at playoffs. For overall win percentage, we need the number of games played in each. We know 4 playoff games were played but how many were played before play offs, we don't know. Hence not sufficient together.

Answer (E)

siddhantvarma
KarishmaB can we solve this question using the concept of weighted average?
Before playoffs: 80%, number of games : unknown
To find overall percentage of games won, we need:
- Percentage of games won before playoffs (given, 80%)
- Total number of games played before playoffs (unknown)
- Percentage of games won after playoffs (unknown)
- Total number of games played after playoffs (unknown)

(1) The team competed in 4 play-off games.
This gives us the Total number of games played after playoffs, but two quanities are still unknown => Inusfficient

(2) The team won all of its play-off games.
This gives us the Percentage of games won after playoffs (100%), but two quanities still unkown => Insufficient

Combining the two, Total number of games played before playoffs is still unknown => (E)
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