Final answer:
Carmela burned 10 calories per minute while using the exercise machine.
Step-by-step explanation:
To calculate the number of calories burned per minute, we need to know the total number of calories burned and the duration of the exercise. Let's assume Carmela burned 200 calories in 20 minutes on the exercise machine.
To find the calories burned per minute, we divide the total calories burned by the duration in minutes. In this case, 200 calories divided by 20 minutes equals 10 calories per minute.
Therefore, Carmela burned 10 calories per minute while using the exercise machine.