A chemist has three different acid solutions. The first acid solution contains 20% acid, the second contains 40% and the third contains 85%. He wants to use all three solutions to obtain a mixture of 60 liters containing 60% 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 (blank) liters of 40% solution, and (blank) liters of 85% solution.
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