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Interesting math problem: how did our ancestors solve the following problem' chickens and rabbits are in the same cage' before they knew the equation?
The number of rabbits is 12/37 of that of chickens, so the number of rabbit feet is 24/37 of that of chickens.

So the sum of chicken feet and rabbit feet is 6 1/37 of chicken feet,

So the number of chickens is 2440/(61/37) =1480, and the number of chickens is 1480/2=740.

The number of rabbits is 740*( 12/37)=240.

Answer: There are 740 chickens and 240 rabbits.

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