Question

21. The average age of Raju and Ravi was
25 years. After 5 years what will be their
average age (in years)
A) 27.5 B) 30 c)32.5 D) 20
(​

Answer 1

Answer:

The average age of Raju and Ravi after 5 years is 30

Step-by-step explanation:

Given :

Average age of Raju and Ravi = 25 years

To find :

The average age of Raju and Ravi after 5 years

Concept :

So , the age of Raju will be 25 years so now add 5 years

And the age of Ravi will be also 25 years and in it also add 5 years because it is the average of both of them and in the question we have to do the sum t years in both of their age .

So , to find the average use this formula -:

$\boxed{\sf{A=\dfrac{Sum\:of\:all\:ages}{Total\:number\:of\:people}}}$

Here , A means average

Solution :

$:\implies\sf{A=\dfrac{25years+5years+25years+5years}{2}}$

$:\implies\sf{A=\dfrac{30years+25years+5years}{2}}$

$:\implies\sf{A=\dfrac{55years+5years}{2}}$

$:\implies\sf{A=\dfrac{60years}{2}}$

$:\implies\sf{A=30\:years}$

So , the average age of Raju and Ravi after 5 years is 30 years .