Q21. Find the average of all the numbers between 6 and 34 which are divisible by 5.
A. 24
B. 20
C. 18
D. 30
Q22. A company produces on an average 4000 items per month for the first 3 months. How many items it must produce on an average per month over the next 9 months, to average 4375 items per month over the whole ?
A. 4710
B. 4600
C. 4500
D. 4680
Q23. The average of first five multiples of 3 is :
A. 9
B. 3
C. 12
D. 15
Q24. 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. 76
D. 70
Q25. The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is :
A. 25
B. 35
C. 27
D. 30
Q26. 16 children are to be divided into two groups A and B of 10 and 6 children. The average percent marks obtained by the children of group A is 75 and the average percent marks of all the 16 children is 76. What is the average percent marks of children of group B ?
A. 235/3
B. 232/2
C. 233/3
D. 236/3
Q27. The average of 50 numbers is 30. If two numbers, 35 and 40 are discarded,then the average of the remaining numbers is nearly :
A. 29.68
B. 28.32
C. 28.78
D. 29.27
Q28. David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology. What are his average marks ?
A. 69
B. 65
C. 72
D. 75
Q29. The average of the first nine prime numbers is :
A. 9
B. 11
C. 101/9
D. 100/9
Q30. A car owner buys petrol at Rs 7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if tie spends Rs. 4000 each year ?
A. Rs. 8
B. Rs. 9
C. Rs. 7.98
D. Rs. 8.50