 ### From a class of 42 boys, a boy aged 10 years goes away and in his place, a new boy is admitted. If on account of this change, the average age of the boys in that class increases by 2 months, the age of the newcomer is :

A. 19 years B. 17 years C. 10 years 6 months D. 12 years 2 months Answer: Option B
Show Answer

### Solution(By Apex Team)

According to the question, Due to newcomer average age is increased by = 2 months Total age increment in 42 boys = 42 × 2 = 84 months or 7 years Note : If the age of newcomer is same as the boy which was replaced then there is no effect on 2 months. ∴ Age of new boy = 10 + 7 = 17 years

## Related Questions On Average

A. 20
B. 21
C. 28
D. 32
Show Answer

A. 18
B. 20
C. 24
D. 30
Show Answer

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years
Show Answer

### If the arithmetic mean of 0, 5, 4, 3 is a, that of -1, 0, 1, 5, 4, 3 is b and that of 5, 4, 3 is c, then the relation between a, b, and c is.

A. a = b = c
B. a : b : c = 3 : 2 : 4
C. 4a = 5b = c
D. a + b + c = 12
Show Answer