The average age of 8 men is increased by years when two of them whose ages are 21 years and 23 years are replaced by two new men. The average age of the two new men is :
A. 50
B. 40
C. 20
D. 30
Answer:D
The average age of 8 men is increased by years when two of them whose ages are 21 years and 23 years are replaced by two new men. The average age of the two new men is :
A. 50 B. 40 C. 20 D. 30