SOLUTION: a pharmacist has 20 liters of a 10% drug solution how many liters of 5% solution must be added to get a mixture that is 8%

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Question 794199: a pharmacist has 20 liters of a 10% drug solution how many liters of 5% solution must be added to get a mixture that is 8%
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let y = how many liters of the 5% drug solution to add.
Very common general problem.

%2820%2A10%2By%2A5%29%2F%2820%2By%29=8

Solve for y.