SOLUTION: How many litres (L) of a 40% glycerine solution must be mixed with 10L of an 80% glycerine solution to obtain a 65% solution?

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Question 816565: How many litres (L) of a 40% glycerine solution must be mixed with 10L of an 80% glycerine solution to obtain a 65% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
This depends on the kind of percent concentration: either w/v or v/v.
This help will be according to percents as volume per volume.

u = how much 40%

%2840u%2B80%2A10%29%2F%28u%2B10%29=65
Solve for u.
8u%2B160=13%28u%2B10%29
8u%2B160=13u%2B130
you can finish?