SOLUTION: To conduct a new experiment, a scientist needs a 33% salt water solution. How much of a 20.5% solution must be mixed with 30 quarts of a 38% solution to get the proper solution?

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Question 352057: To conduct a new experiment, a scientist needs a 33% salt water solution. How much of a 20.5% solution must be mixed with 30 quarts of a 38% solution to get the proper solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 20.5% solution.
20.5%28A%29%2B38%2830%29=33%28A%2B30%29
20.5A%2B1140=33A%2B990
12.5A=150
A=12 quarts