Let x be the money she began with, then 1/3 (x - 4/5 x) = 15 1/3 (1/5 x) = 15 1/15 x = 15 x = 15 15 = $225 Therefore, she started with $225
Let x be the number of students surveyed, then 1/2(x - 1/3x - 1/6x) = 9 1/2(1/2x) = 9 1/4x = 9 x = 4 9 = 36 Therefore, the number of students surveyed is 36.
