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  3. 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 a

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 a

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问题 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?
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答案14 pigs and 22 hens
解析 (假设有x头猪，Y只鸡，那么可得以下方程组：x+Y=36，4x+2y=100；解此方程组可得X=14，Y=22。)
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