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Paper test #14, section #5, question #12

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Paper test #14, section #5, question #12 [#permalink] New post 15 Nov 2005, 21:39
How to solve this problem?


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
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Re: Paper test #14, section #5, question #12 [#permalink] New post 15 Nov 2005, 21:46
maxrum wrote:
How to solve this problem?


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


We know that 50 fish are tagged. Let x be the approx number of fish in the pond.

(2/50)=(50/x), solve for x.

Answer is C
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 [#permalink] New post 15 Nov 2005, 22:29
Thaks! It was easy ;)
  [#permalink] 15 Nov 2005, 22:29
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