A certain lab experiments with white and brown mice only. In one experiment, 2/3 of the mice are white. If there are 9 brown mice in the experiment, how many mice in total are in the experiment?  Choices:  A) 39  B) 33  C) 27  D) 21  E) 10
Let total number of mice = M   Number of white mice = 2/3 M   Number of brown mice = 1/3 M = 9   =&gt; M = 27   Answer 27
<result>C</result>
A certain lab experiments with white and brown mice only. In one experiment, 2/3 of the mice are white. If there are 9 brown mice in the experiment, how many mice in total are in the experiment?