Solve the Problem. -The Manager of a Coffee Shop Has One Type of One

Multiple Choice

Solve the problem.
-The manager of a coffee shop has one type of coffee that sells for $7 per pound and another type that sells for $14 per pound. The manager wishes to mix 90 pounds of the $14 coffee to get a mixture that will sell for $10 per pound. How many pounds of the $7 coffee should be used?

A) 60 lb
B) 120 lb
C) 105 lb
D) 210 lb