# Three years ago, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is the same today. The present age of the baby is:   Option 1)   2 years   Option 2)   2.4 years   Option 3)   4 years   Option 4)   1.5 years   Option 5)   3 years

$3 \: years \: ago=> sum \: of \: ages = 5*17=85$
$Present\: ages \: sum = 85 +(5*3) = 100 years$
$After \: baby\: born; sum = 6 *17 = 102 years.$
$Age \: of\: baby = 102 - 100 = 2 years$