Question

A see saw of length 4m is supported at its center a boy weighing 4n sites at a distance of 1m from the center of the see saw where should a girl weighing 2n sites

Answer 1

What we have to do?

Answer 2

Girl should sit at the edge of the of another side of the see saw I.e. -2 m

I. e. 2 m away from the centre

this explanation can be proved with a formula of centre of mass

as we need the see saw levelled centre of mass must be on the geometrical cente of seesaw

therefore distance of centre of mass I. e. x=0

I will attach an attachment so you get your doubts clear