A chemist has three different acid solutions. The first acid solution contains 20% acid, the second contains 35% and the third contains 65%. They want to use all three solutions to obtain a mixture of 189 liters containing 30% 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 65% solution. liters of 20% solution, liters of 35% solution, and

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