One of the formulas for calculating the correct dosage for a child is as follows: C = a / (a+12) ∙ 180

C = child's dosage in milligrams a = age of the child A = adult dosage in milligrams

What is the prescribed dosage of a certain medicine for a child 6 years old, if the adult dosage of the medicine is 180 milligrams?

I'm assuming you're formula is " C=a / (a+12) * A" as that is only logical

You get the formula "C=a / (a+12) * A"

You insert the numbers given, in place of the letters given.

C=6 / (6+12) * 180

C=3*180

C=540 mg

Which is of course wrong because it is more than the adults dosage. What i'm trying to say is "Your formula is incorrect, follow the steps I gave, but use the correct formula"