Convert to ounces: Convert pounds to ounces.Since 1 pound equals 16 ounces, multiply the number of pounds by 16 to convert it to ounces.Calculation: 3lb×16oz/lb=48oz
Add additional ounces: Add the additional ounces to the total from Step 1.Now, add the 7 ounces to the 48 ounces we already converted.Calculation: 48 oz + 7 oz = 55 oz