Question 250904
.38*30+.28x=.32(30+x)
11.4+.28x=9.6+.32x
.28x-.32x=9.6-11.4
-.04x=-1.8
x=-1.8/-.04
x=45 kg. of 28% alloy ans.       
Proof:
.38*30+.28*45=.32(30+45)
11.4+12.6=.32*75
24=24