<PRE><B>Question 268897</B>
Cowling’s rule. Cowling’s rule is another method for
determining the dosage of a drug to prescribe to a child.
For this rule, the formula 
d=D(a+1)
   24
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I am going to assume that 24 is the denominator of the right side.
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gives the child’s dosage d, where D is the adult dosage
and a is the age of the child in years. 
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If the adult dosage of a drug is 600 milligrams and a doctor uses this
formula to determine that a child’s dosage is 200 milligrams, then how 
old is the child?
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200 = 600(a+1)/24
Multiplying both sides by 24 you get:
4800 = 600(a+1)
Dividing both sides by 600 you get:
8 = a+1
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So a = 7 yrs old
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Cheers,
Stan H.
</PRE>