d = child’s dose 24

I have been assigned to calculate a 5-year-old child’s dose of Tamiflu given at the adult dose of 120mg. d= D(a+1) Cowling’s Rule formula.

24

d= 120(5+1) Cowling’s Rule formula, substituting 120 for D, a for 5 24

d= 120(6) Addition within the parenthesis first. 24

d= 720 Multiplication comes next.

24

d= 30 Division is the last step for this equation. Problem solved with a 5-year-old child’s dose being 30mg of Tamiflu ______________________________________________________________________________ Second part, asked based on the same literal formula, to come up with the child’s age based on the information. 120mg for adult, 300mg for child. With this information, we need to find out the child’s age. d= D(a+1) Cowling’s Rule formula.

24

300= 120(a+1) Cowling’s Rule formula, substituting 120 for D and 300 for d symbol 24

300= 120(a+1) the above formula results in a conditional equation therefore only one 24 value for a to make it true. 300(24)= 120(a+1)24 In order to eliminate the denominator, both sides of the equation 24 need to be multiplied by 24 therefore canceling themselves out 7200= 2,880(a+1) the multiplication is carried out on the right side of the equation.

7200= 120(a+1) both sides are dived by 120

120 120 ...

(1)