Question 138848
2.19x+1.89(20-x)=20*1.99
2.19x+37.8-1.89x=39.8
.3x=39.8-37.8
.3x=2
x=2/.3
x=6.67 kg. of $2.19 wheat flour.
20-6.67=13.33 kg. of $1.89 barley flour.
proof:
2.19*6.67+1.89*13.33=39.8
14.6+25.2=39.8
39.8=39.8