Add the following weights:

13 lb 7 oz

+ 10 lb 2 oz

lb

OZ

23 pounds and 9 ounces (23lb 9 oz)

Step-by-step explanation:

You can add the pounds together and the ounces together separetly. As long as the ounces are less than 16 (since 16 ounces=1 pound), you wont hvae to convert those ounces into pounds. So you can simply add the numbers up to get 23 pounds and 9 ounces