Katy's three 5-pound bags of flour weigh 3*5=<<3*5=15>>15 pounds.
Wendi brought twice as much flour as Katy, or 15*2=<<15*2=30>>30 pounds of flour.
Carrie brought 5 pounds less flour than Wendi, or 30-5=<<30-5=25>>25 pounds of flour.
Thus, Carrie brought 25-15=<<25-15=10>>10 pounds of flour more than Katy.
In ounces, the 10 pound difference is 10*16=<<10*16=160>>160 ounces.
#### 160