Question

A coffee supply store waits until the orders for its special blend reach 100 pounds before making up a batch. Columbian coffee selling for $8.85 a pound is blended with Brazilian coffee selling for $3.85 a pound to make a product that sells for $6.55 a pound. How much of each type of coffee should be used to make the blend that will fill the orders?

Answer 1

Weighted averages:
8.85c + 3.85b = 6.55
c+b=1
Use these two equations to figure out the relative amounts of b and c coffees. The divide up the 100lbs according to these relative amounts.

Answer 2

Since 6.55 is closer to 8.85 than 3.85 you'll need more c to balance out the b.