A 4 m long rod of negligible weight is to be balanced about a point 125 cm from one end. A load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm.

(a) A weight W is placed 250 cm from the support on the longer arm. Find W.

(b) If W = 5 kgf, where must it be kept to balance the rod ?