Question

Three years ago the average age of a family of 5 members was 17 years. With the birth of a new baby, the average remains the same even today. Find out the age of the baby.

• A. 1 year
• B. 3 years
• C. $2\frac{1}{2}years$
• D. 2 years
• E. None of these

Answer 1

The correct option is D 2 years

Present age of 5 members
$=5\times 17+3\times 5)years$.
= 100 years
Present age of 5 members and a baby
$=17\times 6=102years$
$\therefore$ Age of the baby $=(102-100)years=2years$