Question

a body of weight W1 is suspended from the ceiling of room by a chain of weight W2 the ceiling who's the chain by a force

Answer 1

Since the action reaction force is in equlibrum so action reaction force will be equal .The ceiling pulls the chain with a force equal to the sum of weights of chain and the body.So the pulling force = (w1 + w2)..
I hope this is the answer..