A chemist has three different acid solutions. The first acid solution contains 15% acid, the second contains 35% and the third contains 55%. He wants to use all three solutions to obtain a mixture of 252 liters containing 25% acid, using 3 times as much of the 55% solution as the 35% solution. How many liters of each solution should be used?
The chemist should use _________ liters of 15% solution, ________ liters of 35%
solution, and _______ liters of 55% solution.