SOLUTION: How many ounces of 30% hydrochloric acid solution and 80% hydrochloric acid must be mixed to get 10 ounces of 50% hydrochloric acid solution?

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Question 815720: How many ounces of 30% hydrochloric acid solution and 80% hydrochloric acid must be mixed to get 10 ounces of 50% hydrochloric acid solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.3x+.8y=.5*10,
x+y=10
x=6., y=4.