There are 2400 geese in a farm. The number of geese is three fourths of that of ducks, and the number of ducks is four fifths of that of chickens. How many chickens are raised in the farm? I want to make a formula!

2400÷3=800 800 ×4=3200 3200÷4=800 800×5=4000
The answer is 4000

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