Question

Add 18 kg 200g, 13kg 250g, 25 kg

Answer 1

Concert all quantities to grams
i kilogram = 1000 grams

18kg 200 g = 18200 grams
13 kg 250 g = 13250 grams
25 kg.           =25000 grams

on adding we get 56450 grams
in kilograms we write it as 56 kg 450 grams

Answer 2

We must see to it that all are in grams

18 kg = (18×1000)g =18000 g
                                   200 g 
13 kg = (13×1000)g = 13000 g
                                    250 g
25 kg = (25×1000)g = 25000 g

Addition of quantities =(18000+200+13000+250+25000) g= 56450 g

Convert to kg = 56450/1000 kg = 56.450 kg