SOLUTION: What amount of a 15% hcl acid solution must be mixed with a 20% hcl acid solution to obtain 50 milliliters of 18% solution?

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Question 1046199: What amount of a 15% hcl acid solution must be mixed with a 20% hcl acid solution to obtain 50 milliliters of 18% solution?
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Let n be the amount of 20% solution. Then:
.2n+.15(50-n)=.18(50)
.05n+7.5=9
.05n=1.5
n=30
You need 30ml of 20% solution, and 20ml of 15% solution to make 50ml of 18% solution. ☺☺☺☺