Question

Alia age is 9 years old than her twin brothers if they are x years old find their mean age of three children. ​

Answer 1

Step-by-step explanation:

GIVEN

• Alia age is 9 years old than her twin brothers.
• Twin Brothers - x years old.

TO FIND

• The mean age of the three children.

SOLUTION

• Age of Alia's twin brothers = x years
• Alia's age = (9 + x) years.

• Mean = Sum of observations / No. of observation
• Mean age = (9 + x + x + x) / 3
• Mean age = (9 + 3x) / 3
• Mean age = 3(3 + x) / 3
• Mean age = (3 + x) years

So, the mean age of the three children is (3 + x) years.