a big container is 50 % full with water . if 20 liters of water is added , the container becomes 3 / 4 full . what is the capacity of the big container in liters ?
"20 liters is 25 % of the capacity c . 20 = 0.25 c c = 80 liters . the answer is a ."
divide(20, subtract(divide(3, 4), divide(50, const_100)))