Question 114633
.1X+.90*300=.5(300+X)
.1X+270=150+.5X
.1X-.5X=150-270
-.4X=-120
X=-120/-.4
X=300 OUNCES OF 10% COPPER IS REQUIRED.
PROOF:
.10*300+.9*300=.5*600
30+270=300
300=300