A chemist has three different acid solutions. The first acid solution contains 15 % acid, the second contains 25 % and the third contains 65 % . They want to use all three solutions to obtain a mixture of 64 liters containing 50 % acid, using 3 times as much of the 65 % solution as the 25 % solution. How many liters of each solution should be used? The chemist should use liters of 15 % solution, liters of 25 % solution, and liters of 65 % solution.

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