Hey,

I could really use some help solving this mixtures problem. Normally I can just work it out but this one is a little bit different than most.

A solution of 90% alcohol is mixed with a solution of 30% alcohol that is smaller by 20 liters. After 15 liters of water evaporates from the solution, the alcohol content is 72%. How many liters of solution is in the final mixture.

Could really use help working out the method used to solve this type of problem

EDIT:

Solution 1: 90% Alcohol, Volume x

Solution 2: 30% Alcohol, Volume x-20

Total Solution: 72% Alcohol, Volume x+x-20-15 OR 2x-35

This is all the information given. I need to determine that volume in liters of the total solution.