A doctor calculated that her patient needs to take 162 mg of medication each day. The pills that the patient needs only come in doses of 20 mg. How many pills should the patient take each day?

Divide the daily amount by the dose in each pill: 162 ÷ 20 = 8.1 pills. Since pills are taken as whole pills, 8 is the closest listed choice and provides 160 mg. The patient should check with the doctor about the small difference rather than changing the dose without guidance.

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