Final answer:
To convert pounds to ounces, multiply the number of pounds by 16. The duck weighs 56 ounces.
Step-by-step explanation:
To convert a weight from pounds to ounces, you need to multiply the number of pounds by 16. Since the duck weighs 3 1/2 pounds, you can multiply this by 16 to find its weight in ounces.
3 1/2 pounds x 16 = 56 ounces.
So, the duck weighs 56 ounces.