Answer:
Hey mate! Your ans is 50g
Explanation:
the 120 g mass acts at the center of the metre rule (50 cm mark)
... 10 cm from the pivot
the 50 g mass needs to be on the other side of the pivot (> 60 cm mark)
120 g * 10 cm = 50 g
Hope it helped if yes mark me BRAINLIEST..
Tysm!