SOLUTION: To determine the number of fish in a lake, a park ranger catches 220 fish, tags them, and returns them to the lake. Later, 72 fish are caught, and it is found that 20 of them are t

Algebra ->  Equations -> SOLUTION: To determine the number of fish in a lake, a park ranger catches 220 fish, tags them, and returns them to the lake. Later, 72 fish are caught, and it is found that 20 of them are t      Log On


   

Question 1162089: To determine the number of fish in a lake, a park ranger catches 220 fish, tags them, and returns them to the lake. Later, 72 fish are caught, and it is found that 20 of them are tagged. Estimate the number of fish in the lake.
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.

Use the proportion


    20%2F72 = 220%2Fx,


where x is the unknown number of the fish in the lake.


From the proportion, find x


    x = %28220%2A72%29%2F20 = 11*72 = 792.     ANSWER

Solved.

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On proportions, see the lesssons
    - Proportions
    - Using proportions to solve word problems
    - Using proportions to solve word problems in Physics
    - Using proportions to solve Chemistry problems
    - Typical problems on proportions
    - Using proportions to estimate the number of fish in a lake (*)
    - HOW TO algebreze and solve this problem using proportions
    - Problems on proportions for mental solution
    - Selected problems on proportions from the archive
in this site.

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