Suppose you work for a large coffee distributor that has a secret coffee blend it sells to local stores. You mix the Tanzanian blend with the Terraza blend, but always in the same proportion. Yesterday, you mixed
90 pounds of the Tanzanian blend with 18 pounds of the Terraza blend. Today, there is 40 pounds of the
Tanzanian coffee left in stock. How many pounds of the Terraza coffee should you mix with it to get your
secret blend?