Question 185610
.50X+.25(500-X)=.45*500
.50X+125-.25X=225
.25X=225-125
.25X=100
X=100/.25
X=400 G OF 50% COPPER IS USED.
500-400=100 G OF 25% COPPER IS USED.
PROOF:
.50*400+.25*100=.45*500
200+25=225
225=225