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Mathematics sixth grade mathematics wide-angle chicken rabbit cage
One head after another; Feet are chicken 2 rabbits 4;

Chicken head+rabbit head = 28...( 1)

Chicken feet+rabbit feet =2× chicken head +4× rabbit head = 86...(2) chicken head = 13, rabbit head = 15.

The numbers of chickens and rabbits are 13 and 15 respectively.

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