The calorie density D, in calories per ounce, of a food that contains c calories and weighs w ounces is given by the formula D=c/w. Ten ounces of a particular beverage contains 195 calories. Find the calorie density of the beverage.

the calorie density D, in calories per ounce, of food that contains c calories and weighs w ounces is given by D=c/w 
 I think thats your answer