Julia and her husband own a coffee shop. They experimented with mixing a City Roast Columbian coffee that cost $7.80 per pound with French Roast Columbian coffee that cost $8.50 per pound to make a 7-pound blend. Their blend should cost them $8.20 per pound. How much of each type of coffee should they buy? Pounds of City Roast coffee = Pounds of French Roast coffee =