Question:
The average age of five members of a family is 30 years. If the present age of a youngest member of the family is 10 years, what was the average age of the family at the time of birth of the youngest member?
A25 years
B22 years
C20 years
D28 years
Answer:
A. 25 years
Explanation:
Total age of all the members of the family = 30*5= 150 years Total age of the four members at the time of birth of youngest= 150- 10*5= 100 years. Required average of family= 100/4= 25 years.