Suppose you work for a large coffee distributor that has a secret coffee blend it sells to local stores. You mix the Costa Rican blend with the Queen City blend, but always in the same proportion. Yesterday, you mixed 150 pounds of the Costa Rican blend with 120 pounds of the Queen City blend. Today, there is 60 pounds of the Costa Rican coffee left in stock. How many pounds of the Queen City coffee should you mix with it to get your secret blend?

Answer: pounds