What is 1/2 grain (gr) in milligrams (mg)?

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Multiple Choice

What is 1/2 grain (gr) in milligrams (mg)?

Explanation:
Grains to milligrams use a fixed conversion: 1 grain is about 64.8 mg. Half a grain is therefore 32.4 mg. In practice, when rounding to a common whole-milligram amount, 32.4 mg rounds to about 30 mg. That makes 30 mg the best match among the given options. The precise value is 32.4 mg if you need exactness; the other numbers (15 mg, 10 mg, 60 mg) are farther from the true half-grain value.

Grains to milligrams use a fixed conversion: 1 grain is about 64.8 mg. Half a grain is therefore 32.4 mg. In practice, when rounding to a common whole-milligram amount, 32.4 mg rounds to about 30 mg. That makes 30 mg the best match among the given options. The precise value is 32.4 mg if you need exactness; the other numbers (15 mg, 10 mg, 60 mg) are farther from the true half-grain value.

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