Acontainer was 1/2 filled with water. when 200 ml of water was poured out, it became 1/3 full. find the capacity of the container in milliliters.

Let x be the capacity of the container in mililiters;
We solve the equation: (1/2)x = 200 + (1/3)x;
x/2 = 200 + x/3;
(3x)/6 = 1200/6 + (2x)/6;
3x = 1200 + 2x;
x = 1200 mililiters;