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?  Choices:
A) 39
B) 33
C) 26
D) 21
E) 10
Let total number of mice = M   Number of white mice = 2/3 M   Number of brown mice = 1/3 M = 13   =&gt; M = 39   39nswer 39
<result>A</result>
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?