1 gram = 1000 milligrams so 20 grams = 20000 milligrams. Simple!
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1 G = 1,000 mg 0.2 G = 200 mg 0.02 G = 20 mg
3 g is 3000 mg. So there is 20 x 150 mg in 3 g. The answer is 20
1 g = 1,000 mg 5 g = 5,000 mg
1,000 mg = 1 g 6,500 mg = 6.5 g
1000 mg = 1 g ⇒ 110 mg = 110 ÷ 1000 g = 0.11 g