Question

Alia is 9 years old than her twin brothers. If they are x years old, find the mean age of the three children in simplest terms

Answer 1

❄ Given ❄

Alia is 9 years older than her twin brothers.

❄ To Find ❄

The mean age of the three children in simplest terms if they are x years old.

❄ Solution ❄

According to the question,

► Age of Alia's twin brothers = x years

► Alia's age = (9 + x) years

We know,

$\boxed{\sf{\dag\ Mean=\frac{Sum\ of\ observations}{No.\ of\ observations}}}$

Substituting values :-

$\longmapsto$ Mean age = (9 + x + x + x) / 3

$\longmapsto$ Mean age = (9 + 3x) / 3

$\longmapsto$ Mean age = 3(3 + x) / 3

$\longmapsto$ Mean age = (3 + x) years

✨Therefore, the mean age of the three children in simplest terms is 3 + x years.

Answer 2

Given :

• Alia is 9 years old than her twin brothers (9 + x)
• If they are x years old ( x )

To find :

• mean age of the three children in simplest terms

solution :

Mean = sum of observation/Number of observation .....(formula)

=> (9 + x + x + x)/ 3

=> (9 + 3x)/3

=> 3(3 + x)/3

=> 3 + x

=> Answer is 3 + x years