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

Sum of present ages of the six member = ( 17 x 6)years = 102 years.

 Sum of present ages of the 5 members (excluding baby) = 5 x ( 17 -1- 3) years= 100 years.

$\therefore$ Age of the baby = 102 -100 = 2 year,