Last week a patient weighed 218 lb. he now weighs 98.1 kg how many ounces did he lose

Weight of the patient last week = 218 pounds

We already know that

1 kg = 0.453592 pounds

Then

218 pounds = 0.453592 * 218 kg

= 98.8831 kg

= 98.88 kg

Weight of the patient now = 98.10 kg

Then

The amount of weight lost by the patient = (98.88 - 98.10) kg

= 0.78 kg

So the patient loses 0.78 kg within a week. I hope the procedure is clear enough for you to understand. Only conversion part is important to take note while getting to the solution.