Question

A uniform half metre ruler is balanced at 29cm mark. A weight of 20kg is placed at 50cm mark to balance it. Find the weight of the ruler.

Answer 1

Balance the moments of weights on either side of the balancing point 29cm. W is the weight of ruler.

W * (29-25)cm = 20kg * (50-29)cm
W = 105 kg

Answer 2

weight into 4cm=20 into 21cm

weight is 105g.