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A biologist studying the relationship between tilapia and catfish in a pond finds that the ratio of tilapia to catfish is 6:20. If the pond has 30 catfish, how many tilapia are in the pond?

Sagot :

Parrainidn

Answer: 9 tilapia

Step-by-step explanation:

The ratio of 6:20 for tilapia to catfish means that for every six tilapia, there are 20 catfish in the pond.

If there are 30 catfish, use direct proportion to find out the number of tilapia:

6     :      20

x     :       30

Cross multiply:

20x = 180

x = 180 / 20

x = 9 tilapia

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