Answer:
9,719.8 mg
Explanation:
7000 grains = 1 lb
1 lb = 453.59237 g
1 g = 1000 mg
150 grains * (1 lb)/(7000 grains) * (453.59237 g)/(1 lb) * (1000 mg)/(1 g) =
= 9,719.8 mg
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