1. Eighty pounds of 20% copper alloy are to be produced by melting down a bar of 12% alloy with another bar of 32% alloy. How much of each alloy is used?
The two equations should be A + B 80 .12A +.32B .2(80) Two equations with two unknowns is easy to solve ,however I'm getting a negative answer. Either the values you gave are wrong or i missed something.
