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

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Director
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In a certain pond, 50 fish were caught, tagged, and returned [#permalink] New post 02 Apr 2006, 01:37
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C
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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
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 [#permalink] New post 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
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 [#permalink] New post 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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