Question

The manager of a coffee shop has one type of coffee that sells for $7 per pound and another type that sells for $11 per pound. The manager wishes to mix 60 pounds of the $11 coffee to get a mixture that will sell for $8 per pound. How many pounds of the $7 coffee should be used?

Answer 1

[7s+60(11)]/(s+60)=8

7s+660=8s+480

s=180

So 180lbs of the $7 coffee should be mixed with the 60lbs of the $11 coffee to make a mixture worth $8/lb