The CoffeeShop is creating a new blend of coffee. Coffee A sells for $5 per pound. Coffee B sells for $9 per pound. The
CoffeeShop will mix 20 pounds of the new blend and sell it for $6
per pound. The following equations represent the problem of
keeping the cost of the blend consistent with the ingredients.
a + b = 20
5a + 9b = 120
a = pounds of Coffee A and b = pounds of Coffee B
How many pounds of Coffee B should be used in the blend?