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To add, you need to have everything in the same units. I'll go with grams.

1 g = 1000 mg = 10 dg = 100 cg

1500 mg = 1.5 g ; 25 dg = 2.5 g ; 2000 cg = 20 g

1.5 g + 2.5 g + 20 g = 24 g

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14y ago

What else can I help you with?