Final answer:
To find the number of patients with either high blood pressure or high cholesterol levels, but not both, subtract the number of patients with both conditions from the total number of patients with either condition.
Step-by-step explanation:
To find the number of patients that had either high blood pressure or high cholesterol levels, but not both, we need to subtract the number of patients that had both conditions from the total number of patients who had either condition.
Let's assume that the total number of patients is represented by variable 'n'. If 'x' patients had both high blood pressure and high cholesterol levels, and 'y' patients had only high blood pressure, then the number of patients with only high cholesterol levels would be 'n - x - y'.
From the given options, none of the values match our result. Therefore, the correct answer is not provided in the options.