Question

How many ounces of nuts are in a box that holds 3.2 pounds?

Answer 1

We need to find out how many ounces in 1 pound.

1 pound = 16 ounces.

Now let us set up a proportion to solve. 

1/16 = 3.2/x

Cross multiply.

1*x = 1x
16*3.2 = 51.2

51.2 = 1x

x = 51.2

Final answer: The amount of ounces in 3.2 pounds are 51.2 ounces.

51.2 ounces. 

Answer 2

So first of all, we know that 16 oz= 1 pound.
Let's do a quick calculation:
3.2 pounds*(16 oz/1 pound)= 51.2 oz.
Note that pound (in 3.2 pounds) and pound (in 1 pound) cancels out so you get the oz unit.
Hope that would help :))