how many liters of water must be evaporated from 50 liters of a 3 percent sugar solution to get a 4 percent sugar solution ?
"let x be the amount that needs to be evaporated . 0.03 ( 50 ) = 0.04 ( 50 - x ) 0.04 x = 2 - 1.5 x = 0.5 / 0.04 = 12.5 liters the answer is a ."
subtract(50, multiply(divide(50, const_100), 4))