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# In a certain pond, 50 fish were caught, tagged, and returned

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Intern
Joined: 24 Nov 2003
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Location: Champaign
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In a certain pond, 50 fish were caught, tagged, and returned [#permalink]

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28 Nov 2003, 06:49
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Difficulty:

15% (low)

Question Stats:

74% (02:17) correct 26% (01:13) wrong based on 325 sessions

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In a certain pond, 50 fish were caught, tagged, and returned to the pond. A few days later, 50 fish were caught again, of which 2 were found to have been tagged. If the percent of tagged fish in the second catch approximates the percent of tagged fish in the pond, what is the approximate number of fish in the pond?

(A) 400
(B) 625
(C) 1,250
(D) 2,500
(E) 10,000

OPEN DISCUSSION OF THIS QUESTION IS HERE: in-a-certain-pond-50-fish-were-caught-tagged-and-returned-119175.html
[Reveal] Spoiler: OA

Last edited by Bunuel on 28 Oct 2013, 16:00, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
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28 Nov 2003, 07:49
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What's there to disagree with?

This is a rather straight forward ratio problem.

1. 50 fish tagged

2. 2 out of the 50 fish caught were tagged thus 2/50

2/50=50/x

thus, x=1250

Think of the analogy: 2 fish is to 50 Fish as 50 fish is to ...?

You've tagged 50 fish and you need to find what that comprises as a percentage of the total fish population - we have that information with the ratio of the second catch.

Last edited by Titleist on 28 Nov 2003, 07:57, edited 1 time in total.
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28 Nov 2003, 07:52
Got it - thanks - i was trying to use too much of (FLAWED) logic.
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Re: In a certain pond, 50 fish were caught, tagged, and returned [#permalink]

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28 Oct 2013, 10:53
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: In a certain pond, 50 fish were caught, tagged, and returned [#permalink]

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28 Oct 2013, 16:00
OPEN DISCUSSION OF THIS QUESTION IS HERE: in-a-certain-pond-50-fish-were-caught-tagged-and-returned-119175.html
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Re: In a certain pond, 50 fish were caught, tagged, and returned [#permalink]

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24 Nov 2014, 11:39
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: In a certain pond, 50 fish were caught, tagged, and returned   [#permalink] 24 Nov 2014, 11:39
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