Katy, Wendi, and Carrie went to a bread-making party.  Katy brought three 5-pound bags of flour.  Wendi brought twice as much flour as Katy, but Carrie brought 5 pounds less than the amount of flour Wendi brought.  How much more flour, in ounces, did Carrie bring than Katy?
Please reason step by step, and put your final answer within \boxed{}.
user