how many liters of water must be evaporated from 50 liters of a 4 percent sugar solution to get a 5 percent sugar solution ?
"let x be the amount that needs to be evaporated . 0.04 ( 50 ) = 0.05 ( 50 - x ) 0.05 x = 2.5 - 2 x = 0.5 / 0.05 = 10 liters the answer is d ."
subtract(50, multiply(divide(50, const_100), 5))