As children grow, dosages for medications gradually approach those for adults. Clark’s rule is often used to determine the correct dosage for children.

Child’s dose = Adult dose x (Weight of child in pounds)/(150 pounds)

What dosage should be administered to a child weighing 28 pounds if the adult dose of a certain drug is 80 milligrams? Round your answer to the nearest whole milligram.
How much would a child have to weigh to receive the adult dosage? Explain why your answer is reasonable.