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16. The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average one number, namely 36 was wrongly read as 26. The correct average is :
A. 12.4
B. 14
C. 16
D. 18.6
Explanation: ANSWER : 16
17. The average of odd numbers upto 100 is:
A. 51
B. 50
C. 49.5
D. 49
Explanation: ANSWER : 50
18. The average of three numbers is 42. The first is twice the second and the second is twice the third. The difference between the largest and the smallest number is :
A. 18
B. 36
C. 54
D. 72
Explanation: ANSWER : 54
19. The average of the daily income of A, B and C is Rs. 60. If B earns Rs. 20 more than C and A earns double of what C earns; what is the daily income of C ?
A. Rs. 75
B. Rs. 60
C. Rs. 40
D. none of these
Explanation: ANSWER : 40
20. The average of 6 observations is 12. A new seventh observation is included and the new average is decreased by 1. The seventh observation is :
A. 1
B. 3
C. 5
D. 6
Explanation: ANSWER : 5
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