The average age of a group of 10 persons was decreased by 3 years when one person, whose age was 42 ...

The 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?

Quiz

Answer/Solution

12

Steps/Work

Initial average age of the 10 persons be P.
Age of the new person Q.
Sum of the ages of the initial 10 persons = 10P
New average = (P-3) 10(P-3) = 10P - 42 + Q => Q = 12.Answer:C

General Calculator / Auto Solver

The average age of a group of persons was decreased by years when one person, whose age was years, was replaced by a new person. Find the age of the new person?

Calculated Answer

12

Step by Step Solution

In order to solve problem, you must evaluate n2 - n0 * n1.

n0 =10
n1 =3
n2 =42