Which statement correctly relates 1 grain to milligrams?

Which statement correctly relates 1 grain to milligrams?

• A. 1 grain equals 65 mg
• B. 1 grain equals 50 mg
• C. 1 grain equals 75 mg
• D. 1 grain equals 10 mg

Answer: (A)

Grains and milligrams are two ways to measure tiny drug amounts. A grain is an apothecary unit equal to 1/7000 of a pound. With a pound weighing 453.59237 grams, one grain equals 453.59237 / 7000 ≈ 0.0648 grams, which is about 64.8 milligrams. In practice, we round to about 65 mg per grain, so the statement that 1 grain equals 65 mg is correct. The other options don’t match this standard conversion (they would correspond to different, nonstandard amounts).

Grains and milligrams are two ways to measure tiny drug amounts. A grain is an apothecary unit equal to 1/7000 of a pound. With a pound weighing 453.59237 grams, one grain equals 453.59237 / 7000 ≈ 0.0648 grams, which is about 64.8 milligrams. In practice, we round to about 65 mg per grain, so the statement that 1 grain equals 65 mg is correct. The other options don’t match this standard conversion (they would correspond to different, nonstandard amounts).