Question

if my weight on the earth is 30 kg what will the weight of Mine on moon

Answer 1

The gravity at the surface of the Moon is about 1/6 that is Earth. So a 30 kg (ignoring that kg is a unit of mass not a weight force) mass would ‘weigh’ 1/6 (30) or 5 kg. Note that the mass of the object doesn’t change.

Answer 2

the moon's gravity is only one sixth of that of earth .hence the weight of the person weighing 30kg on earth the on the moon would be just 5kg