###
**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

### Ajit has a certain average for 9 innings. In the tenth innings, he scores 100 runs thereby increasing his average19 people went to a hotel for combine dinner party 13 by 8 runs. His new average is:

A. 20B. 21

C. 28

D. 32

### Find the average of all the numbers between 6 and 34 which are divisible by 5.

A. 18B. 20

C. 24

D. 30

### In a family, the average age of a father and a mother is 35 years. The average age of the father, mother and their only son is 27 years. What is the age of the son?

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C. 11 years

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### 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 = cB. a : b : c = 3 : 2 : 4

C. 4a = 5b = c

D. a + b + c = 12