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The average age of four brothers is 12 years. If the age of their mother is included in their age then the average age increase by 5 years. Find the age of their mother?
1. 51 years
2. 48 years
3. 37 years
4. 43 years

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Correct Answer - Option 3 : 37 years

Given:

Average age of 4 brothers = 12 years

Average age after age of mother is included = (12 + 5) years

⇒ 17 years

Formula used:

Sum of ages = Average age × Number of persons

Calculation:

Sum of ages of 4 brothers = 12 × 4 years

⇒ 48 years

Sum of ages of 4 brothers and mother = 17 × 5 years

⇒ 85 years

Age of mother = (85 – 48) years

⇒ 37 years

∴ The age of mother is 37 years

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