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

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Director
Joined: 05 Feb 2006
Posts: 902
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Kudos [?]: 50 [0], given: 0

In a certain pond, 50 fish were caught, tagged, and returned [#permalink]  02 Apr 2006, 01:37
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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
Current Student
Joined: 29 Jan 2005
Posts: 5244
Followers: 23

Kudos [?]: 178 [0], given: 0

[#permalink]  02 Apr 2006, 01:43
(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
VP
Joined: 29 Apr 2003
Posts: 1405
Followers: 2

Kudos [?]: 18 [0], given: 0

[#permalink]  02 Apr 2006, 02:23
The Answer is C

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

Solving, we get: X = 1250!

Voila.. its C!
[#permalink] 02 Apr 2006, 02:23
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# In a certain pond, 50 fish were caught, tagged, and returned

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