how many liters of water must be evaporated from 50 liters of a 4 percent sugar solution to get a 10 percent sugar solution ?
"let x be the amount that needs to be evaporated . 0.04 ( 50 ) = 0.1 ( 50 - x ) 0.1 x = 5 - 2 x = 3 / 0.1 = 30 liters the answer is e ."
subtract(50, multiply(divide(50, const_100), 10))