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Solve a math problem in the fifth grade of primary school
Solution: The number of roosters is only X, and the number of hens is 2X+30.

According to the meaning of the equation:

X+2X+30=480

3X=480-30

3X=450

x = 450 \3

X= 150

Hen: 2X+30=2X 150+30=330.

Answer: There are only 150 cocks and 330 hens.

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