Generally, 60% of the mass of body is water.
So, amount of water in 100 kg person is:
[tex]100 kg\times \frac{60}{100} = 60 kg[/tex]
In order to calculate the mass of a person if all the water were removed, then:
[tex]Mass of the body - Mass of the content of water in the body[/tex]
Mass of the body = [tex]100 kg[/tex][
Mass of the content of water in the body = [tex]60 kg[/tex]
Substituting the values:
Mass of a person if all the water were removed = [tex]100 kg -60 kg = 40 kg[/tex].
Hence the mass of a person who weighs [tex]100 kg[/tex] will weigh [tex]40 kg[/tex] if all the water were removed from the body.
