If 150 mg of Robitussin is required and the concentration is 50 mg per 5 mL, how many milliliters are needed?

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Multiple Choice

If 150 mg of Robitussin is required and the concentration is 50 mg per 5 mL, how many milliliters are needed?

Dosage calculations rely on converting the concentration to mg per milliliter and then applying volume = dose ÷ (mg per mL). The concentration 50 mg in 5 mL equals 10 mg per mL. To deliver 150 mg, you need 150 mg ÷ 10 mg/mL = 15 mL. Checking: 15 mL × 10 mg/mL = 150 mg. For reference, 10 mL would be 100 mg, 12 mL would be 120 mg, and 20 mL would be 200 mg, so 15 mL is the correct amount.

Dosage calculations rely on converting the concentration to mg per milliliter and then applying volume = dose ÷ (mg per mL). The concentration 50 mg in 5 mL equals 10 mg per mL. To deliver 150 mg, you need 150 mg ÷ 10 mg/mL = 15 mL. Checking: 15 mL × 10 mg/mL = 150 mg. For reference, 10 mL would be 100 mg, 12 mL would be 120 mg, and 20 mL would be 200 mg, so 15 mL is the correct amount.

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