-3^2 - 1^2 -(-2)^3+(-1)^2-(-1-5)^3
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Let denote the volume of the 75% and 90% solutions to use, respectively. We want to end up with a 360L solution, so
.
We want this new solution to have an 85% concentration so that it would contain 0.85*360L = 306L of antifreeze. The volume of antifreeze contributed by the reagent solutions are and
, and their total should match the new solution's total volume of antifreeze, so that
.
Solve this system and you get and
.