A farmer has a total of 224 animals. He has 38 more sheep than cows and 6 more cows than pigs. How many pigs does he have

【参考答案】

58[解析] 该题可通过简单的一元方程式得出：设这位农民有X头牛，那么他有(38+X)只羊和(X-6)头猪，X+(38+......

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