The average of seven numbers is 18. If one of the number is 17 and if it is replaced by 31, then the average becomes:
(A) 20
(B) 21
(C) 21.5
(D) 19.5
The average monthly salary of the workers in a workshop is Rs. 8,500. If the average monthly salary of 7 technicians is Rs.10,000 and average monthly salary of the rest is Rs. 7,800, the total number of workers in the workshop is
(A) 22
(B) 24
(C) 18
(D) 20
A cricketer had a certain average of runs for his 64 innings. In his 65th innings, he is bowled out for no score on his part. This brings down his average by 2 runs. His new average of runs is:
(A) 70
(B) 68
(C) 130
(D) 128
The average of four consecutive even numbers is 15. The 2nd highest number is:
(A) 14
(B) 16
(C) 12
(D) 18
The average of marks scored by the students of a class is 68. The average of marks of the girls in the class is 80 and that of the boys is 60. What is the percentage of boys in the class?
(A) 65%
(B) 70%
(C) 40%
(D) 60%
The average salary, per head, of all the workers of an institution, is Rs. 60. The average salary of 12 officers is Rs. 400; the average salary, per head, of the rest is Rs. 56. The total number of workers in the in situation is
(A) 1032
(B) 1020
(C) 1030
(D) 1035
Eight consecutive numbers are given. If the average of the two numbers that appear in the middle is 6, then the sum of the eight given numbers is:
(A) 36
(B) 48
(C) 54
(D) 64
The average of 5 numbers is 27. If one number is excluded, the average becomes 25. The excluded number is:
(A) 30
(B) 35
(C) 25
(D) 27
Three numbers are such that the average of first two numbers is 2, the average of the last two numbers is 3 and the average of the first and the last numbers is 4, then the average of three numbers is equal to.
(A) 3
(B) 2.5
(C) 2
(D) 3.5
The average weight of a group of 20 boys was calculated to be 89.4 kg and it was later discovered that one weight was misread as 78 kg instead of 87 kg. The correct average weight is
(A) 89.55 kg
(B) 89.85 kg
(C) 88.95 kg
(D) 89.25 kg
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