ssccglapex

The average age of 30 boys in a class in 15 years. One boy, aged 20 years, left the class, but two new boys came in his place whose age differs by 5 years. If the average age of all the boys now in the class becomes 15 years, the age of the younger newcomer is :

A. 20 years B. 15 years C. 10 years D. 8 years Answer: Option B
Show Answer

Solution(By Apex Team)

Let the age of younger boy = x years Then the age of older boy = (x + 5) According to the question, ⇒ (30 × 15) – 20 + x + x + 5 = 31 × 15 ⇒ 430 + 2x + 5 = 465 ⇒ 2x = 30 ⇒ x = 15

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

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

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

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 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



More Related Questions On Average