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

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In a certain pond, 50 fish were caught, tagged, and returned [#permalink] New post 28 Nov 2003, 05:49
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76% (02:16) correct 24% (00:50) wrong based on 96 sessions
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, 15:00, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
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 [#permalink] New post 28 Nov 2003, 06:49
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, 06:57, edited 1 time in total.
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 [#permalink] New post 28 Nov 2003, 06:52
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] New post 28 Oct 2013, 09:53
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Re: In a certain pond, 50 fish were caught, tagged, and returned [#permalink] New post 28 Oct 2013, 15:00
Expert's post
Re: In a certain pond, 50 fish were caught, tagged, and returned   [#permalink] 28 Oct 2013, 15:00
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