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- 百钱买鸡问题:一百个铜钱买了一百只鸡,其中公鸡一只5钱、母鸡一只3钱,小鸡一钱3只、问一百只鸡中公鸡母鸡、小鸡各多少。?(100 yuan to buy chicken problem: one hundred copper coins bought one hundred chickens, of which 5 were cock, 3 for hens, 3 for chickens, one hundred for roosters, hens and chicks.)