Question

a box contain 500000 medicine tablets each weighing 10 mg . what is the total weight of all the tablets in the box in kilograms

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Answer 1

Total weight =  500000 * 10 mg
                       =  5000000 mg
                       =  5000000/1000 grams
                       =  5000 grams
                       =  5000/1000 Kg
                       =  5 Kg 

Answer 2

MASS OF ONE TABLET=10*10^-3g=10^-2g=10^-5kg
SO FOR 500000 TABLET IT IS =500000*10^-5
                                              =5kg