Curren's Math for Meds 11th Edition by Anna Curren, Anna Curren, Mark Lehman, Margaret Witt, Debra Gentene

Exercise 40

For each of the following combined Regular and NPH insulin dosages, indicate the total volume of the combined dosage and the smallest capacity syringe you can use to prepare it; 30, 50, and 100 unit capacity syringes are available.
13 units Regular, 27 units NPH