A balanced lever has two weights on it, one with mass #2 kg# and one with mass #16 kg#. If the first weight is # 8 m# from the fulcrum, how far is the second weight from the fulcrum?
You can use the principle of moments. The moment of a force is the force multiplied by the perpendicular distance of the force from the fulcrum.
For the lever to be balanced the anti - clockwise moments must balance the clockwise moments.
So from the diagram we can write: