A balanced lever has two weights on it, one with mass #5 kg# and one with mass #20 kg#. If the first weight is # 9 m# from the fulcrum, how far is the second weight from the fulcrum?
First of all convert the masses into weight by multiplying them with the gravitational force which is 10
now use the formula
Also apply the the principle of moments which is the anticlockwise moment=clockwise moment