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. 11 years
B. 14 years
C. 15 years
D. 15 2/7 years
A pupil’s marks were wrongly entered as 83 instead of 63. Due to the average marks for the class got increased by half. The number of pupils in the class is ___?
A. 10
B. 20
C. 40
D. 73
If the arithmetic mean of seventy five numbers is calculated, it is 35. If each number is increased by 5, then mean of new number is ___?
A. 30
B. 40
C. 70
D. 90
In the first 10 overs of a cricket game, the run rate was only 3.2. What should be the rate in the remaining 40 overs to reach the target of 282 runs?
A. 6.25
B. 6.5
C. 6.75
D. 7
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. 2
B. 4
C. 70
D. 76
The average of 35 students in a class is 16 years. The average age of 21 students is 14. What is the average age of remaining 14 students?
A. 15 years
B. 17 years
C. 18 years
D. 19 years
The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is ____?
A. 25
B. 27
C. 30
D. 35
A library has an average of 510 visitors on Sunday and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is ____?
A. 250
B. 276
C. 280
D. 285
A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?
A. 28 4/7 years
B. 31 5/7 years
C. 32 1/7 years
D. None of these
