Answer
$112\ mg$
Work Step by Step
Convert the weight of the person to kg:
$165\ lb\cdot\frac{453.6\ g}{1\ lb}\cdot \frac{1\ kg}{10^3\ g}=74.8\ kg$
Multiply the weight by the dose ratio:
$74.8\ kg\cdot 1.5\ \frac{mg}{kg}=112\ mg$
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