Question

The average age of three brothers is 25 years.If the age of two
brothers is 20 years and 22 years, find the age of the third brother?

Answer 1

Answer:

The age of the third brother is = 33 years

Step-by-step explanation:

Let the age of the third brother is = x years

Now it is given that the average age of three brothers is 25 years

And the age of first brother is = 20 years

And the age of second brother is = 22 years

So, the average age of three brothers is

= (20+22+x) /3

Now by given condition,

(20+22+x) /3 = 25

=> 20+22+x = 25×3 = 75

=> 42+x = 75

=> x = 75-42

=> x = 33

Therefore the age of third brother is = 33 years

Answer 2

Answer:

The age of the third brother is 33 years.

Step-by-step explanation:

The average  of  $n$ numbers is obtained by dividing their sum by the number $n$.

Here, we have given the average age of three brothers and the age of two brothers. We need to find the age of the third brother.

The average age = 25 years

The age of the first one= 20 years

The age of the second one = 22 years

Let the age of the third one be $x$. Then we have the equation,

$\implies \dfrac{20+22+x}{3} = 25$

On solving, we obtain

$\implies 42+x=25\times 3=75\\\\\implies x= 75-42= 33$

The age of the third brother is 33 years.