The average weight of 7 persons increases by 3 kg when a new person comes in place of one of them weighing 56 kg. What might be the weight of the new person?

Correct option is B

Given:

Average increases by 3 kg

Number of persons = 7

One person of 56 kg is replaced

Formula Used:

Increase in average leads to total increase in weight = Increase × Number of persons

New person’s weight = Weight of replaced person + Total increase

Solution:

Total increase = 3 × 7 = 21 kg

New person’s weight = 56 + 21 = 77 kg