Question

a uniform metre rule of Mass 150g is pivoted at 60cm Mark.cal the mass which when hung at the 85cm Mark will balance horizontally

Answer 1

no idea

Answer 2

Calculating moments about the piviot point:
150*10cm-M*25cm=0
M=1500/25 grams

Answer 3

CM=ACM
50-60=10
85-60=25
10×150=1500
1500=25
=60g