The average age of a family of six members is 30 years. The youngest members of the family are twins with age 10 years. Find the average age of the family just before the birth of the twins.
A. 28 years
B. 25 years
C. 30 years
D. 32 years
Answer:C
The average age of a family of six members is 30 years. The youngest members of the family are twins with age 10 years. Find the average age of the family just before the birth of the twins.
A. 28 years B. 25 years C. 30 years D. 32 years