SOLUTION: John wants to make a 100ml of 5% alchohal solution mixing a quantity of 2% alchohal solution with a 7% solution. What is the quantity of 2% and 7%?

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Question 453639: John wants to make a 100ml of 5% alchohal solution mixing a quantity of 2% alchohal solution with a 7% solution. What is the quantity of 2% and 7%?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
100x5=500
x+y=100
2x+7y=500
2x+2y=200
5y=300
y=60
x=40
You need 40 ml of 2% solution and 60 ml of 7% solution for the required mix..