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 Organic Free Trade blend, but always in the same proportion. Yesterday, you mixed 70 pounds of the Costa Rican blend with 28 pounds of the Organic Free Trade blend. Today, there is 20 pounds of the Costa Rican coffee left in stock. How many pounds of the Organic Free Trade coffee should you mix with it to get your secret blend?

Answer: pounds