Question

The average age of 4 siblings is 12 years if the age of their mother is also included average age increased by 5 what is the age of their mother

Answer 1

Age of each sibling is given as 12 years.

$\therefore{}$ Age of 4 siblings => 4 × 12

=> 48 years.


Now, let the age of their mother be x

When the mother is also included, her age becomes 48 + x


Average = $\dfrac{48 + x}{5}$ which is given as 12 + 5 = 17


According to the question,

$\dfrac{48 + x}{5}$ = 17

48 + x = 17 × 5

48 + x = 85

x = 85 - 48

x = 37



$\therefore{}$ Age of mother is $\underline{37 \: years}$

Answer 2

Here is your solutions

Given that :-

Age of each sibling is given as 12 years.

Total number of siblings is 4

Total age of 4 siblings =>4 × 12

=> 48 years.

Again

Let the age of their mother be x

When the mother is also included then  5 years age increase  .

A/q

=>(48 + x) / 5 = 12 +5

=>48 + x = 17 × 5

=>48 + x = 85

=>x = 85 - 48

x = 37

Hence,

The Age of mother is  37 years .

Hope it helps you