Question

6. The average age of 5 boys is 13 years. One more bo
joins them and the average age becomes 12 years
Find the age of the boy who joins.
​

Answer 1

Answer:

Age of new join boy = 7 years

Step-by-step explanation:

Given :

Average age of 5 boys = 13 years

Average age after joining a new boy = 12 years

To find :

The age of the new boy that join

Concept :

Use this formula to find the age of the now boy join -:

$\boxed{\sf{N=(12years\times6)-(13years\times5)}}$

Where,

N = Age of new boy join

Here ,

First we have to find the total age of all 5 boys and then we have to subtract from total age of 6 boys . Then , we will get the age of the new boy join .

Solution :

$:\implies\sf{N=(12years\times6)-(13years\times5)}$

$:\implies\sf{N=72years-65years}$

$:\implies\sf{N=7 years}$

So , the age of new join boy is 7 years.