a certain lab experiments with white and brown mice only . in one experiment , 2 / 5 of the mice are brown . if there are 12 white mice in the experiment , how many mice in total are in the experiment ?
"let total number of mice = m number of brown mice = 2 / 5 m number of white mice = 3 / 5 m = 12 = > m = 20 answer a"
subtract(divide(12, divide(2, 5)), 12)