A chemist has three different acid solutions. The first acid solution contains 20% acid, the second contains 30% and the third contains 60%. They want to use all three solutions to obtain a mixture of 66 liters containing 35% acid, using 2 times as much of the 60% solution as the 30% solution. How many liters of each solution should be used?
The chemist should use
liters of 20% solution,
solution, and
liters of 60% solution.
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liters of 30%