题目信息
At the moment there are 54,210 tagged birds in a certain wildlife refuge. If exactly 20 percent of all birds in the refuge are tagged, what percent of the untagged birds must be tagged so that half of all birds in the refuge are tagged?
A:25
B:30
C:$$33\frac{1}{3}$$
D:$$37\frac{1}{2}$$
E:50
参考答案及共享解析

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已选答案:
正确答案:
D:$$37\frac{1}{2}$$
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题目来源
Magoosh