Question 120517
d= D( a + 1)
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       24

determine the dosage for the child based on this information

D = adult
d = child
adult dossage 600 milligrams and the doctor uses the formula above to estimate childs dosage at 200 milligrams how old is the child?
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200 = 600(a+1)/24
Divide both sides by 200 to get:
1 = 3(a+1)/24
Reduce the fraction on the right side to get:
1 = (a+1)/8
Cross-multiply to get:
a+1 = 8
a = 7
The child's age is 7
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Cheers,
Stan H.