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The question, as stated, cannot be answered sensibly. A gallon is a measure of volume, with dimensions [L3]. A milligram is a measure of mass, with dimensions [M]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As a simple mental exercise consider a gallon of air and a gallon of water. They will have very different masses.
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Earn +20 ptsQ: 1 gallon equals how many mg?
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1 mg equals how many min?
1 mg equals how many grams?
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1000 mcg equals 1 mg.
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