A chemist has three different acid solutions. The first acid solution contains 25 % acid, the second contains
35 % and the third contains 65 %. He wants to use all three solutions to obtain a mixture of 72 liters
containing 50 % acid, 'using 2 times as much of the 65 % solution as the 35 % solution. How many liters of
each solution should be used?
The chemist should use
liters of 25 % solution,
liters of 35 % solution, and
liters of 65 % solution.