math
posted by Christina on .
Alex came home after school one day and found that his mother had left a plate of cookies. Alex ate 1/4 of the cookies. When his sister Bernice came home, she ate 1/3
of the remaining cookies, and when Carla came home, she ate 1/2
of the cookies on the plate. When their mother came home, there were 3 cookies on the plate. How many did each child eat?

Let x = # of cookies originally on the plate.
x  1/4x  1/3(1/4x)  1/2(1/3)(1/4x) = 3
Solve for x, then solve for each one of the three subtracted terms.