SOLUTION: ``A nurse is told to give a patient recovering from surgery a total of 21 units of a potent antibiotics over 3 days. The dosage should be cut in half the second day, then in half
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Question 944544: ``A nurse is told to give a patient recovering from surgery a total of 21 units of a potent antibiotics over 3 days. The dosage should be cut in half the second day, then in half again for the third day. How many units should she administer on the first day??
Pleae help. I know it's easy but I can't seem to grasp it.
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
Let D=dosage third day, 2D is dosage second day and 4D is dosage first day
4D+2D+D=21 units: Total for three days is 21 units
7D=21 units
D=3 units: She would administer 3 units on Day 3
2D=6 units She would administer 6 units on Day 2
4D=12 units She would administer 12 units on Day 1 ANSWER
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