Hi, 

Let x represent the amount of the 15% solution needed.  

Then (80L-x) would be the amount of 10% solution

.15x + .10(80L-x) = .12*80L

solve for x

.05x = .02*80L

x = 32L of the 15% solution is needed



checking our answer

.15*32L + .10*48 = 4.8 + 4.8 = 9.6 

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