A chemist has three different acid solutions. The first acid solution contains 20% acid, the second contains 40 % and the third contains 85 %. They want to use all three solutions to obtain a mixture of 84 liters containing 45 % acid, using 2 times as much of the 85 % solution as the 40 % solution. How many liters of each solution should be used? The chemist should use and liters of 20% solution, liters of 85% solution. liters of 40% solution,

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