A chemist has three different acid solutions. The first acid solution contains 20 % acid, the second contains 30% and the third contains 50 %. They want to use all three solutions to obtain a mixture of 60 líters containing 40 % acid, using 3 times as much of the 50 % solution as the 30 % solution. How many liters of each solution should be used? The chemist should use liters of 20 % solution, liters of 30 % solution, and liters of 50 % solution.

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