A doctor prescribes a treatment in which a patient takes 3 teaspoons of a medication every 8 hours for 10 days. According to the prescription, how many teaspoons of the medication should the patient take in a 24-hour period?

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In some cases, questions will have additional information that's not necessary for solving the problem. In this case, it is irrelevant how long the patient takes the medication. We only need to know the amount of medication he or she needs to take over the course of 24 hours or 1 day.

$$ \frac{3 \text{ teaspoons}}{8 \text{ hours}} = \frac{x \text{ teaspoons}}{24 \text{ hours}} $$ $$ x=\boxed{9} $$