Final answer:
For a prescription of Coumadin 5mg to be taken on even days using only 5mg scored tablets, a single tablet is needed each even day.
Step-by-step explanation:
The question pertains to a scenario where a physician has prescribed Coumadin to be taken in different dosages on even and odd days, with the requirement that only 5mg scored tablets of Coumadin be used. On even days, the prescription is for 5mg of Coumadin. Since the tablets available are 5mg each and are scored, the quantity needed on even days matches the prescription exactly, meaning one tablet is needed on even days.