RRB Group-D Model Paper 20 with answers for online practice

Given
The average ages of parents and two children are 30 years and 8 years respectively.
Calculation
Sum of age of parents = 2 × 30 = 60 years
Sum of the age of two children = 2 × 8 = 16 years
Now, sum of age of 4 members in the family = 60 + 16 = 76 years
∴ Average age of whole family = 76/4 = 19 years