The average age of a family of 5 members three years ago was 17 years. In spite of the birth of a child in the family during these 3 years, the present average age of the family remains the same. What is the present age of the child?
A2 years ✓ Correct
B3 years
C2.5 years
D3.5 years
Correct answer: (A) 2 years
Explanation
The child is 2 years old.
3 years ago total age = 5 x 17 = 85.
Now the 5 members total 85 + 5 x 3 = 100.
Present family of 6 keeps average 17: total = 6 x 17 = 102.
Child's age = 102 - 100 = 2 years.
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