The averge age of two brothers is 9 years it is incresed by 9 years when their mother age is also included then age of mother is
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Average age of 2 brothers = 9
Average = Sum/Number
Sum = Average * Number
Sum of ages of brothers = 9*2 = 18
Average of 3 people(mother and 2 brothers) = 9+9 = 18
Sum = 18*3 = 54
Age of mother = 54-18 = 36 years.
Average = Sum/Number
Sum = Average * Number
Sum of ages of brothers = 9*2 = 18
Average of 3 people(mother and 2 brothers) = 9+9 = 18
Sum = 18*3 = 54
Age of mother = 54-18 = 36 years.
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