Answer: 19.5 calories per ounce.
Explanation:
Given : The calorie density D, in calories per ounce, of a food that contains c calories and weighs w ounces is given by the formula :

Also, Ten ounces of a particular beverage contains 195 calories.
Then put w=10 and c = 195 in the above equation, we get

Hence, the calorie density of the beverage = 19.5 calories per ounce.