A medication is 40 mg per 5 mL. If 20 mL are administered, how many milligrams are given?

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Multiple Choice

A medication is 40 mg per 5 mL. If 20 mL are administered, how many milligrams are given?

Explanation:
With a fixed concentration, the dose scales with the volume given. The concentration is 40 mg in 5 mL, which is 8 mg per mL. So 20 mL provides 20 × 8 mg = 160 mg. Equivalently, 20 mL is four times the 5 mL amount, so the dose is 4 × 40 mg = 160 mg.

With a fixed concentration, the dose scales with the volume given. The concentration is 40 mg in 5 mL, which is 8 mg per mL. So 20 mL provides 20 × 8 mg = 160 mg. Equivalently, 20 mL is four times the 5 mL amount, so the dose is 4 × 40 mg = 160 mg.

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