STEP 1:
convert cat and dog's weights to ounces; multiply dog or cat's weight by
16 ounces per pound and then add the additional ounces each weighs
1 pound= 16 ounces
DOG
= (18 pounds * 16 oz/lb) + 10 ounces
= 288 + 10
= 298 ounces
CAT
= (6 pounds * 16 oz/lb) + 3 ounces
= 96 + 3
= 99 ounces
STEP 2:
subtract the difference in the dog's and cat's weights from step 1
= 298 oz dog - 99 oz cat
= 199 ounces
ANSWER: Jim's dog weighs 199 ounces more than his cat.
Hope this helps! :)