(u) suivc iuli. allied health nurses use a formula known as young's rule to determine the amount of medicine to give a child under 12 years of age when the adult dosage is known. als nie scule c = ad/a + 12 is the child's dose; a is the age of the child in years; d is the adult dose. (a) work backward and find the adult dose in terms of the child's dose. solve for d. (b) find d if c = 0.05 gram and a = 7.