From the first equation, $ y = 20 - x $. Substitute into the second: $ 0.15x + 0.05(20 - x) = 2 $. Simplify: $ 0.15x + 1 - 0.05x = 2 $ → $ 0.10x = 1 $ → $ x = 10 $. Then $ y = 10 $. Thus, $ \boxed10 $ liters of each solution are needed. - Groen Casting