Question 160634
65x+90(20-x)=80*20
65x+1800-90x=1600
-25x=1600-1800
-25x=-200
x=-200/-25
x=8 pounds of 65 cent grain.
20-8=12 pounds of 90 cent grain.
Proof:
65*8+90*12=1600
520+1080=1600
1600=1600