Average age of a group of 10 persons was decreased by 3 years when one person, whose age was 42 years, was replaced by a new person. Find the age of the new person ? February 2, 2024 – by admin 0A. 5B. 56C. 23D. 12Sum of the ages of the initial 10 persons = 10PNew average = (P-3) 10(P-3) = 10P – 42 + Q => Q = 12