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

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Question 589168: How many liters of a 20% solution of a chemical should be mixed with 15 liters of a 50% solution to get a 30% mixture?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
-------------- percent ---------------- Amount
Chemical I 50 ---------------- 15 liters
Chemical II 20 ---------------- x liters
Total 30 ---------------- 15 + x liters

50*15+20x=30(15 +x)
750+20x =450+30 x
20x-30 x=-750+ 450
-10x=-300
/ -10
x = 30 liters Chemical II
30 liters Chemical I
m.ananth@hotmail.ca