Question

Rewrite 20 oz as ____ lb ____ oz, using 1 pound = 16 ounces. You don’t need to use the unit-fraction method.

Answer 1

Step 1: Write the unit conversion

1 pound = 16 ounces

which means

1 lb = 16 oz

Step 2: Apply the conversion rate

If 16 oz = 1 lb

Then let 20 oz be represented by y

As shown in the diagram above, y will be obtained by cross multiplying

$y\text{ =}\frac{20\text{ x 1}}{16}\text{ =}\frac{20}{16}=\frac{5}{4}\text{ = 1.25 pounds}$

Answer is

20 0z is 1.25 lb