SOLUTION: How many litres of a 30% acid solution should be added to 20 litres of 60% acid solution in order to obtain a 50% acid solution?

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Question 472377: How many litres of a 30% acid solution should be added to 20 litres of 60% acid solution in order to obtain a 50% acid solution?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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How many litres of a 30% acid solution should be added to 20 litres of 60% acid solution in order to obtain a 50% acid solution?
:
Let x = amt of 30% solution required
:
Write a decimal equiv, mixture equation
.30x + .60(20) = .50(x+20)
.30x + 12 = .5x + 10
12 - 10 = .5x - .3x
2 = .2x
x = 2%2F.2
x = 10 liters of 30% stuff required