Question: A chemist has three different acid solutions. The first acid solution contains 20% acid, the second contains 30%, and the third contains 50%. He wants

A chemist has three different acid solutions. The first acid solution contains 20% acid, the second contains 30%, and the third contains 50%. He wants to use all three solutions to obtain a mixture of 80 liters 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?

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