Question 306913
8x+6(144-x)=7.50*144
8x+864-6x=1,080
2x=1,080-864
2x=215
x=216/2
x=108 pounds of $8 coffee is uded.
144-108=36 pounds of $6 coffee is used.
Proof:
8*108+6*36=7.50*144
864+216=1,080
1,080=1,080