SOLUTION: how many ml of 20% acid solution should be added to pure acid to obtain 40 ml of 45% acid solution?

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Question 890349: how many ml of 20% acid solution should be added to pure acid to obtain 40 ml of 45% acid solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
You also want to be able to find how many ml. of the pure 100% acid. The quantities of both acids to be mixed are unknown.

The problem is fully explained and solved in this lesson: Mixing two concentrations for known amount of mixture - http://www.algebra.com/tutors/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev