SOLUTION: ​Young's rule for determining the amount of a medicine dosage for a child is given by the​ formula, c=ad/a+12​, where a is the​ child's age and d is the usu

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Question 1058288: ​Young's rule for determining the amount of a medicine dosage for a child is given by the​ formula, c=ad/a+12​, where a is the​ child's age and d is the usual adult​ dosage, in milligrams. An 8​-year-old child needs medication. What adult dosage can be used if a​ child's dosage must stay between 100 mg and 200 ​mg?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39616)   (Show Source): You can put this solution on YOUR website!
Write your equation with the necessary care. c=ad/a+12 would be the same as the rendered form, which simplifies to and this is not what you really have.

Your equation must use correctly placed grouping symbols: c=ad/(a+12) which will properly show as .

The question requires solving the equation, or formula, for a in terms of c.
Answer by MathTherapy(10551)   (Show Source): You can put this solution on YOUR website!
​Young's rule for determining the amount of a medicine dosage for a child is given by the​ formula, c=ad/a+12​, where a is the​ child's age and d is the usual adult​ dosage, in milligrams. An 8​-year-old child needs medication. What adult dosage can be used if a​ child's dosage must stay between 100 mg and 200 ​mg?
If formula is: , then:  

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