Suppose you work for a large coffee distributor that has a secret coffee blend it sells to local stores. You mix the Ethiopian blend with the Rift Valley blend, but always in the same proportion. Yesterday, you mixed 80 pounds of the Ethiopian blend with 112 pounds of the Rift Valley blend. Today, there is 20 pounds of the Ethiopian coffee left in stock. How many pounds of the Rift Valley coffee should you mix with it to get your secret blend?
