The average age of two brothers is 9 years. It is increased by 9 years when their mother's age is also included then the age of mother is

35 years

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36 years

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37 years

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38 years

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Solution

The correct option is A 36 years
Given the average age of two brothers is 9 years
Then total age = $9 \times 2 = 18$ years
If mothers age included the average age =9+9=18 years
Then total age of mother and two brothers = $18 \times 3 = 54$ years
So age of mother =54-18=36 years

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The average age of two brothers is 9 years. It is increased by 9 years when their mother's age is also included then the age of mother is

The correct option is A 36 yearsGiven the average age of two brothers is 9 yearsThen total age =9×2=18 yearsIf mothers age included the average age =9+9=18 years Then total age of mother and two brothers =18×3=54 years So age of mother =54-18=36 years

The correct option is A 36 years
Given the average age of two brothers is 9 years
Then total age = $9 \times 2 = 18$ years
If mothers age included the average age =9+9=18 years
Then total age of mother and two brothers = $18 \times 3 = 54$ years
So age of mother =54-18=36 years