Question 316622
5x+3(100-x)=4.18*100
5x+300-3x=418
5x-3x=418-300
2x=118
x=118/2
x=59 pounds of $5 coffee.
100-59=41 pounds of $3  coffee.
Proof:
5*59+3*41=4.18*100
295+123=418
418=418