Final answer:
To calculate the total number of units to be administered, you need to add the number of units for Humulin NPH to the number of units for Humulin Regular. In this case, the total number of units to be administered is 65 units.
Step-by-step explanation:
To calculate the total number of units to be administered, we need to add the number of units for Humulin NPH to the number of units for Humulin Regular.
In this case, you need to administer 40 units of Humulin NPH and 25 units of Humulin Regular.
So, the total number of units to be administered is 40 + 25 = 65 units.