SOLUTION: How many liters of a 15% sugar solution must be mixed with 5 liters of a 45% sugar solution to give a 20% solution?

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Question 891382: How many liters of a 15% sugar solution must be mixed with 5 liters of a 45% sugar solution to give a 20% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The concentration percent would be as mass per volume. Dimensions must ONLY be in mass and volume.

This lesson deals with these kinds of two part mixture problems:
Mixing two concentrations for known amount of mixture - http://www.algebra.com/tutors/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev

That also contains a general solution.