If a child weighs 18 kg, and the adult dose is 75 mg, how many milligrams should the child receive?
16.5
17.3
19.8
22.4
19.8
Rationale: By using Clark's rule, first convert kilograms to pounds: 1 kg = 2.2 lbs. Use this formula: 1 kg / 2.2 lbs = 18 kg / X lbs. X = 39.6 lbs. Substitute into the equation: 39.6 / 150 x 75 mg = 19.8 mg.
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