A farmer has a field containing a certain number of pigs and hens. Between them they have 36 heads and 100 feet. How many pigs and hens does the farmer have

【参考答案】

14 pigs and 22 hens(假设有x头猪，Y只鸡，那么可得以下方程组：x+y=36，4x+2y=100；解此......

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