rahul purchased 5kg400g of rice,2700g of sugar and 10kg of flour.Total weight purchased by rahul

15kg 7400g

Total weight = 5kg 400g = 5.4kg +2700g = 2.7kg+10kg = 18.1kg

I gave my answer but first u have to give me the correct answer.

18100 grams

5kg400g=  5400g                               5kg400g=5.4kg
2700g    =  2700g                               2700g    =2.7kg
10kg      =10000g                               10kg      =10kg
              =18100g                                             =18.1kg

18.1kg