First you multiply the 8 by 18 because it tells you it weighs 18 more pounds then what it did before. You also need to multiply to get how many ounces he weighs in order to convert. When you multiply you get 144 ounces. Now your going to divide 144 by 16 because there are 16 ounce in 1 lb. You know ur dividing because ur converting from a smaller unit to a larger unit. When you divide you get 9 lbs.