The two bags of cat food weigh 2 x 3 = <<2*3=6>>6 pounds.
Each bag of dog food weighs 3 + 2 = <<3+2=5>>5 pounds.
So two bags of dog food weigh 2 x 5 = <<2*5=10>>10 pounds.
Thus, Mrs. Anderson bought 6 + 10 = <<6+10=16>>16 pounds of pet food.
And 16 pounds is equal to 16 x 16 = <<16*16=256>>256 ounces.
#### 256