Question 75365
100*11.25=x*12+(100-x)9
1125=12x+900-9x
12x-9x=1125-900
3x=225
x=225/3
x=75 pounds of $12 coffee.
100-75=25 pounds of $9 coffee.
proof
100*11.25=75*12+25*9
1125=900+225
1125=1125