Ch-1 Force unsolved numerical 14 diagram shows a uniform metre rule 100gf Jatin Academy

Class 10 ICSE physics
Unsolved numerical 14
Book: Concise physics
The diagram in figure 1.34 shows a uniform metre rule weighing 100 gf, pivoted at its centre O. Two weights 150 gf and 250 gf hang from the points A and B of the metre rule such that OA= 40 cm and OB =20 cm. calculate
i) the total anticlockwise moment about O
ii) the total clockwise moment about O
iii) the difference from O where a 100 gf weight should be placed to balance a metre rule.