Given: Average age of father and mother is 68 and average age of son and daughter is 33. Formula used: Average age =
Totalage
Noofperson
Calculation: Total age of father and mother = 2 × 68 = 136 Total age of son and daughter = 2 × 33 = 66 So total age of all family members = 136 + 66 = 202 No of persons in family = 4 Average age =
Totalage
Noofperson
⇒
202
4
⇒ 50.5 ∴ The average age of all family members is 50 years 6 months.