2. 外语
  3. A certain lab experiments with white and brown mice only. In one experiment, 2/3 of the mice are white. If there are 13 brown mi

A certain lab experiments with white and brown mice only. In one experiment, 2/3 of the mice are white. If there are 13 brown mi

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问题 A certain lab experiments with white and brown mice only. In one experiment, 2/3 of the mice are white. If there are 13 brown mice in the experiment, how many mice in total are in the experiment?
选项 A、39
B、33
C、26
D、21
E、10
答案A
解析 Brown mice make up 1/3 of the mice in the experiment, so the total number of mice is 13×3=39.
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