Amount of calories contained in a 10 ounce container = 200 calories
Then
Amount of calories in each ounce = (200/10) * 1 calories
= 20 * 1 calories
= 20 calories
So the amount of calories contained in each ounce of milk is 20 calories. I hope the procedure is clear enough for you to understand. You can always use this method for solving similar problems without requiring any help from outside. Only be careful about the calculation part, otherwise the problem is simple. Hope i have helped you.