Question 1071292
x=number  of l needed.
.0635x+(25)(.1128)=(25+x)(.08), the "pure" amount
.0635+2.82=2+.08x
-0.0165x=-.82
x=49.7 liters.
Rough check.
This is about twice as much of the lower amount, and the lower amount is 1.65% less concentrated and the higher amount is 3.3% more concentrated.  This makes sense.