Question

The average age of three brother is 15 years . If the age of two brother is 15 years and 12 years , find the age of the third brother​

Answer 1

Answer:

15+12+x÷3=15

27+x=45

x=45-27

X=18 will be the age

Step-by-step explanation:

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Answer 2

$\color{Blue}\huge{Answer}$

The average age of 3 brother is 15 years.

Age of brother 1, $x_1=15\ yrs$

Age of brother 2, $x_2=12\ yrs$

We need to find the age of the third brother. The

average of three numbers is given by :

$A=\dfrac{x_1+x_2+x_3}{3}$

$15=\dfrac{15+12+x_3}{3}$

On solving, $x_3=18\ yrs$

So, the age of the third brother  is 18 year's.