The average weight of 12 people is 65 kg. If one person leaves and the new average becomes 64.5 kg, what is the weight of the person who left?

Correct option is A

Given:

Average weight of 12 people = 65 kg
After one person leaves, new average of remaining 11 people = 64.5 kg

Formula Used:
Total weight = average × number of people.

​Solution:​

​$$\text{Weight left} = (12 \times 65) - (11 \times 64.5)$$​​

= 780 - 709.5 = 70.5 kg