Question

shyam is 7 feet tall and weight 51kg.ram is tall 7feet and weight 4200g.who is heavier and how much?

Answer 1

ram = 4200g
shyam=51kg
           =51000 g
difference = 51000 - 4200
                 =46800g
shyam is heavier than ram by 46800gs

Answer 2

shyam height = 7
shyam weight = 51 kg

and 

ram height = 7 feet
ram weight = 4200 g 

we know 1 kg = 1000g 

so 4200 is 4.2 kg

so now we can say that shyam is heavier than ram  46.8 kg