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The average age of 4 member of a family is 25 yr. If head of the family is included in this group then average age increase by 20%. Find out the age of the head.
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- 45 yr
- 50 yr
- 55 yr
- 60 yr
Correct Option: B
Total age of 4 member = 25 x 4 = 100 yr
Total age of 5 members including the head
= 5 x (25 + 25 x 20/100)
= 5 x 30 = 150 yr
∴ Age of the head = 150 - 100 = 50 yr
