问题
选择题
某牧场，放养的鸵鸟和奶牛一共70只，已知鸵鸟和奶牛的腿数之和为196条，则鸵鸟的头数比奶牛多（ ）
A．20只
B．14只
C．15只
D．13只
答案
设奶牛的头数为x，则鸵鸟的头数为70-x，
故：4x+2（70-x）=196，
解得x=28，
故70-2x=14，
故选B．
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某牧场，放养的鸵鸟和奶牛一共70只，已知鸵鸟和奶牛的腿数之和为196条，则鸵鸟的头数比奶牛多（ ）
A．20只
B．14只
C．15只
D．13只
设奶牛的头数为x，则鸵鸟的头数为70-x，
故：4x+2（70-x）=196，
解得x=28，
故70-2x=14，
故选B．
| 从方框中选词填空。 | |
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