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 60 pounds of the $14 coffee to get a mixture that will sell for $13 per pound. How many pounds of the $7 coffee should be used?
◦ 35 pounds
◦ 70 pounds
◦ 10 pounds
◦ 5 pounds