SOLUTION: Nicolas works in a lab. He needs a 15% acid solution for a certain test, but the supplier only ships a 10% solution and a 30% solution. He needs 10 liters of the 15% acid solution.

Question 818280: Nicolas works in a lab. He needs a 15% acid solution for a certain test, but the supplier only ships a 10% solution and a 30% solution. He needs 10 liters of the 15% acid solution. How many liters of 10% solution and 30% solution should he use?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
w = weak solution
s = strong solution
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w + s = 10
s = 10 - w
10w + 30s = 15(10)
NOTE: the problem can also be solved with this equation (both equations will work):
0.10w + 0.30s = 0.15(10)
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10w + 30s = 150
10w + 30(10 - w) = 150
10w + 300 - 30w = 150
20w = 150
---
w = 150/20
w = 7.5 liters
s = 2.5 liters
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