a2zinterviews

24.	The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students is 14 years and that of the other 9 students is 16 years. The age of the 15th student is
	A.  9 years
	B.  11 years
	C.  14 years
	D.  21 years

Solution

Age of the 15th student =[15x15-(14x5+16x9)] = (225 - 214) = 11 years.

25.	The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings so as to increase his average of runs by 4?
	A.  40
	B.  65
	C.  72
	D.  76

Solution

Average after 11 innings = 36. ∴ Required number of runs = (36x11)-(32x10) = 396 - 320 = 76.

26.	The average monthly salary of 20 employes in an organisation is Rs.1500. If the manager's salary is added, then the average salary increases by Rs.100. What is the manager's monthly salary?
	A.  Rs. 2000
	B.  Rs. 2400
	C.  Rs. 3600
	D.  Rs. 4000

Solution

Manager's monthly salary = Rs.(1600x21-1500x20) = Rs. 3600

27.	The average of first five multiples of 3 is
	A.  3
	B.  6
	C.  9
	D.  12

Solution

Average = 3(1+2+3+4+5) / 5 = 45 / 5. = 9.