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 :
A) 2 yrs B) 2.4 yrs C) 3 yrs D)1.5 yrs

• 3 years back average age is 17
  now 17*5=85+(5*3)=100
  now average age of 6(baby)=17
  17*6=102
  baby age=102-100=2 years
• 10 years agoHelpfull: Yes(5) No(0)
• 2 years
  5*17=85+3*5=100
  6*17=102
  2
  
• 9 years agoHelpfull: Yes(1) No(0)
• total ages =85 then
  sum of ages before 3 years=17*5=85
  now the total ages=85+(3*5)+X
• 11 years agoHelpfull: Yes(0) No(4)