a certain lab experiments with white and brown mice only . in one experiment , 2 / 3 of the mice are white . if there are 7 brown mice in the experiment , how many mice in total are in the experiment ?
"let total number of mice = m number of white mice = 2 / 3 m number of brown mice = 1 / 3 m = 7 = > m = 21 answer d"
subtract(divide(7, divide(2, 3)), 7)