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Clarks rule states that you divide the child's weight in pounds by 150 to get the percentage of the adult dose. Since 200 is 33% of 600; we can conclude that the child weighs 50 pounds. This is the average weight of a 6 to 7 year old.

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Q: If the adult dosage of a drug is 600 mg and a doctor uses this formula to determine that a child's dosage is 200 mg then how old is the child?
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