SOLUTION: How many liters of a 20% solution should be mixed with 15L of a 50% solution to get a 30% solution?

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Question 421832: How many liters of a 20% solution should be mixed with 15L of a 50% solution to get a 30% solution?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
percent ---------------- quantity
50 ---------------- 15
20 ---------------- x
30 ---------------- 15+x
......
50*15+20 *x=30(15 +x)
0
750+20x= 450+30x
20x-30x =450-750
-10x=-300
/-10
x=30 liters