Question

The boy A weighs 50 kg and the girl B weighs 35 kg in a seesaw...the board of the seesaw is 3.6 meter... To balance the seesaw where should girl C who weighs 25 kg seat or what particular distance should girl C seat to balance it
There's lots unsaid here. Are A and B on the same side of the board? If so, it is unreasonable to expect a 25kg girl to balance the combined 85kg of the other two.

You need some more information here, like distances and such.

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