# Mat 221 Cowling’s Rule

**Topics:**Multiplication, Elementary arithmetic, Addition

**Pages:**2 (373 words)

**Published:**August 24, 2013

D = adult dose – 75 mg

d = child’s dose

I have been assigned to calculate a 5-year-old child’s dose of tamiflu given that the adult dose is 75mg. d = D (a + 1) The Cowling’s Rule formula

24

d = 75 (5 + 1) Substituted 75 for D and 5 for a.

24

d = 75 (6) Add 5+1 inside parenthesis, equals 6.

24

d = 450 Multiply 75 X 6 =450

24

d = 18.75Division is the last step in solving for the child’s dose. The proper dose of tamiflu for a 5 year old child is 19mg.

For part B of the discussion I will determine a child’s age based on the dose of medicine he/she was prescribed. The same equation can be used, but I will be solving for another variables instead of d. The dose is 1200mg for an adult and 300mg for child. I will be solving the equation for a. The following is the variables for the equation: a = child’s age

D = adult dose – 1200 mg

d = child’s dose – 300 mg

d = D (a + 1) The Cowling’s Rule formula

24

300= 1200(a + 1) Substituted 1200 for D and 300 for d.

24

300(24) = 1200(a + 1)(24) Multiplied by 24 to eliminate denominator. 24

7200 = 1200(a + 1) Multiplication on left side is

24carried out.

7200= 1200 (a + 1) Divide both sides by 1200

1200 1200

6= a+1One last stepped before the equation is solved.

6 – 1 = a + 1 – 1Subtract 1 from both sides to isolate a.

5= ANow I have solved.

The dose of 300mg is intended for a five-year-old child. There are only one potential answer for this...

Please join StudyMode to read the full document