how many liters of water must be evaporated from 50 liters of a 3 - percent sugar solution to get a 10 - percent solution ?
"3 % of a 50 liter solution is 1.5 l . so you are trying to determine how many liters must a solution be for the 1.5 l to represent 10 % of the solution . set up an inequality and solve for x : 1.5 / x = 1 / 10 x = 15 since you need a 15 l solution , you must evaporate 35 of the original 50 l solution to get a 10 % solution . answer is a ."
subtract(50, multiply(divide(50, const_100), 10))