SOLUTION: how much 30% solution and 80% solution need to be mixed to make 500ml of a 60% solution

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Question 846370: how much 30% solution and 80% solution need to be mixed to make 500ml of a 60% solution
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.3a+.8b=.6*500,
a+b=500
a=200., b=300.