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.
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the age of twin brother is x
the age of alia is (x + 9)
mean age of 3 children = [x + x + ( x + 9 )]/3.
= ( 3x + 9 )/3
= (x + 3) years
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