how many liters of water must be evaporated from 50 liters of a 2 percent sugar solution to get a 5 percent sugar solution ?
"let x be the amount that needs to be evaporated . 0.02 ( 50 ) = 0.05 ( 50 - x ) 0.05 x = 2.5 - 1 x = 1.5 / 0.05 = 30 liters the answer is c ."
subtract(50, multiply(divide(50, const_100), 5))