A chemist has three different acid solutions. The first acid solution contains 15 % acid, the second contains 35 % and the third contains 80 % . They want to use all three solutions to obtain a mixture of 66 liters containing 40 % acid, using 2 times as much of the 80 % solution as the 35 % solution. How many liters of each solution should be used? The chemist should use [: liters of 15 % solution, :] liters of 35 % solution, and l l liters of 80 %