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⇒ The average of first 50 natural numbers is :
12.25
21.25
25
25.5

⇒ The sum of three consecutive odd numbers is 38 more than the average of these numbers. What is the first of these numbers?
13
17
19
None of these

⇒ In a set of three numbers, 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. What is the average of three numbers?
2
2.5
3
3.5

⇒ The average monthly income of A and B is Rs. 5050. The average monthly income of B and C is Rs. 6250 and the average monthly income of A and C is Rs. 5200. What is the monthly income of A?
4000
3000
2000
1000

⇒ Find the average of all composite numbers between 1 and 15.
10
10.5
9.5
9

⇒ If the mean of 5 observations x, x+2, x+4, x+6 and x+8 is 11, then the mean of the last three observations is: (C.D.S. 2003)
11
13
15
17

⇒ The average of 11 observations is 60. If the average of first five observations is 58 and that of the last five is 56, then the sixth observation is. [Assistant Grade]
90
85
110
100

⇒ In an examination, a student's average marks were 63. If he had obtained 20 more marks for his Geography and 2 more marks for his history, his average would have been 65. How many subjects were there in the examination?
11
12
13
14

⇒ The average of 5 consecutive odd numbers is 25. Find the smallest of these numbers.
21
19
25
29

⇒ The average price of 10 books is Rs.12 while the average price of 8 of these books is Rs.11.75. Of the remaining two books, if the price of one book is 60% more than the price of the other, what is the price of each of these two books?
Rs. 5, Rs.7.50
Rs. 8, Rs. 12
Rs. 10, Rs. 16
Rs. 12, Rs. 14

⇒ The average age of our family of four is 35. Excluding me, the average age is 40. Find my age.
20
25
30
15

⇒ In Arun's opinion, his weight is greater than 65 kg but less than 72 kg. His brother doest  not agree with Arun and he thinks that Arun's weight is greater than 60 kg but less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all are them are correct in their estimation, what is the average of different probable weights of Arun?
67 kg.
68 kg.
69 kg.
Data inadequate

⇒ The average mark of a class in a mathematics exam is 65. The sum of the marks of all students is 2210. How many students are there in the class?
34
44
32
42

⇒ The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:
17 kg
20 kg
26 kg
31 kg

⇒ The average of first five multipies of 3 is :
3
9
12
15

⇒ 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?
77(1/3)
77(2/3)
78(1/3)
78(2/3)

⇒ The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is  45.15 kg. Find the average weights of all the boys in the class.
47.55 kg
48 kg
48.55 kg
49.25 kg

⇒ The average monthly salary of 12 workers and 3 managers in a factory was Rs. 600. When one of the manager whose salary was Rs. 720, was replaced with a new manager, then the average salary of the team went down to 580. What is the salary of the new manager?
570
420
690
640

⇒ The average weight of 8 person's increases by 2.5 kg when a new person comes in place of  one of them weighing 65 kg. What might be the weight of the new person?
76 kg
76.5 kg
85 kg
Data inadequate

⇒ The average of the two digit numbers, which remain the same when the digits interchange  their position is: (C.D.S. 2003)
33
44
55
66

⇒ The average of five different positive numbers is 25. x is the decrease in the average when the smallest number among them is replaced by 0. What can be said about x?
x is less than 5
x is greater than 5
x is equal to 5
Nothing can be said

⇒ If the average of x and y is 30 and the average of y and z is 20, find x-z.
10
15
30
20

⇒ A motorist travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for the whole journey in km per hour is :. [Bank P.O. 1991]
35
37.5
37
40

⇒ In Arun's opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Arun and he thinks that Arun's weight is greater than 60 kg but less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all are them are correct in their estimation, what is the average of different probable weights of Arun?
67kg
68kg
69 kg
Data inadequate

⇒ Find the average of all the numbers between 6 and 34 which are divisible by 5 (C.B.I 1997)
18
20
24
30

⇒ The average of 50 numbers is 30. If two numbers, 35 and 40 are discarded, then the average of the remaining numbers is nearly:
28.32
28.78
29.27
29.68

⇒ The average height of a class of 30 students is 166 cm. The average height of the girls in the class is 158 cm and the average height of the boys is 170 cm. Find the number of boys in the class.
10
20
18
15

⇒ When a student weighing 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of the remaining 59 students?
57
56.8
58.2
52.2

⇒ There were 35 students in a hostel. Due to the admission of 7 new students the expenses of  the  mess  were  increased  by  Rs.42  per  day  while  the  average  expenditure  per  head diminished by Re 1. What was the original expenditure of the mess?
Rs. 450
Rs. 320
Rs. 550
Rs. 420

⇒ The average age of boys in the class is twice the number of girls in the class. If the ratio of boys and girls in the class of 36 be 5 : 1, what is the total of the ages (in years) of the boys in the class. [Bank P.O. 1989]
490
420
196
360
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