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 BShow 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?
A. 10 yearsB. 10.5 years
C. 11 years
D. 12 years
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