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The number of geese raised by a professional farmer is equivalent to 7 / 20 of the number of chickens and 2 / 5 of the number of ducks, and there are 10 more chickens than ducks How many chickens, ducks and geese have been raised by specialized farmers?
According to the title, the number of chickens is 20 / 7 of the number of geese, and the number of ducks is 5 / 2 of the number of geese,
It is known that there are 10 more chickens than ducks
The number of ducks is 10 ÷ (20 / 7-5 / 2) = 28,
The number of chickens is 28 × (20 / 7) = 80,
The number of ducks is 80-10 = 70
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