SOLUTION: How many liters of a 70% alcohol solution must be added to 50 liters of a 40% alcohol solution to produce a 50% alcohol solution?

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Question 1053047: How many liters of a 70% alcohol solution must be added to 50 liters of a 40% alcohol solution to produce a 50% alcohol solution?

Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Let n be the amount of 70% solution to be added. Then:
.7n+.4(50)=.5(50+n)
.7n+20=25+.5n
.2n=5
n=25
You need 25 liters of 70% solution for your mixture. ☺☺☺☺