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

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Director
Joined: 06 Feb 2006
Posts: 893

Kudos [?]: 117 [0], given: 0

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

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02 Apr 2006, 02:37
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0% (00:00) correct 0% (00:00) wrong based on 1 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) 1250
D) 2500
E) 10000

Kudos [?]: 117 [0], given: 0

Current Student
Joined: 29 Jan 2005
Posts: 5210

Kudos [?]: 432 [0], given: 0

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02 Apr 2006, 02:43
(C) in about 15 seconds if you know the trick.

Use a ratio expression and solve for X: ---> 2/50=50/X ---> 2X=2500 ---> X=1250

Kudos [?]: 432 [0], given: 0

VP
Joined: 29 Apr 2003
Posts: 1403

Kudos [?]: 29 [0], given: 0

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02 Apr 2006, 03:23

2/50 == 50/X where X is the total Number of Fish

Solving, we get: X = 1250!

Voila.. its C!

Kudos [?]: 29 [0], given: 0

02 Apr 2006, 03:23
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