Quantitative Aptitude

General Questions

Quantitative Aptitude Exercise Mode

General Questions

Practice and master this topic with our carefully crafted questions.

10 Questions
15 Minutes
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Question 1
Find the average of all the number between 6 and 34 which are divisible by 5.

A
18
B
20
C
24
D
30
Correct Answer: Option B

Hence, required average

= 10 + 15 + 20 + 25 + 30 = 100 = 20
5 5

Question 2
The average of first five multiples of 3 is :

A
3
B
9
C
12
D
15
Correct Answer: Option B

Required average

= 3(1 + 2 + 3 + 4 + 5) = 45 = 9
5 5

Question 3
The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?

A
0
B
1
C
10
D
19
Correct Answer: Option D

Average of 20 numbers = 0.

Sum of 20 numbers (0 x 20) = 0.

It is quite possible that 19 of these numbers may be positive and if their sum is a then 20th number is (-a).

Question 4
The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers ?

A
2
B
5
C
8
D
Cannot be determined
E
None of these
Correct Answer: Option C

Let the number be x, x + 2,  x + 4, x + 6, and x + 8.

Then,

x + (x + 2) + (x + 4) + (x + 6) + (x + 8)   = 61

                                     5

5x + 20 = 305

x = 57

So, required  difference = (57 + 8) - 57 = 8

Question 5
A library has an average of 510 visitors on Sundays 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
Correct Answer: Option D

Since the month begins with a Sunday, so there will be five Sundays in the month.

 Required average :

=   510 x 5 + 240 x 25 = 8550 = 285.
30 30

Question 6
The average of five number is 27. If one number is excluded, the average becomes 25. The excluded number is :

A
25
B
27
C
30
D
35
Correct Answer: Option D

Excluded number = (27 x 5) - (25 x 4)

= 135 - 100 = 35.

Question 7
The average of six numbers is 3.95. The average of two of them is 3.4, while the average of the other two is 3.85. What is the average of the remaining two numbers ?

A
4.5
B
4.6
C
4.7
D
4.8
Correct Answer: Option B

Sum of the remaining two numbers

= (3.95 x 6) -[(3.4 x 2) + (3.85 x 2)]

= 23.70 - (6.8 + 7.7)

= 23.70 - 14.5

= 9.20

Required average = 9.2/2 = 4.6

Question 8
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 :

A
17 kg
B
20 kg
C
26 kg
D
31 kg
Correct Answer: Option D

Let A, B, C represent their respective weights. Then, we have:

A + B + C = (45 x 3) = 135 .... (i)

A + B = (40 x 2) = 80 .... (ii)

B + C = (43 x 2) = 86 ....(iii)

Adding (ii) and (iii), we get: A + 2B + C = 166 .... (iv)

Subtracting (i) from (iv), we get : B = 31.

B's weight = 31 kg.

Question 9
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is :

A
53.33
B
54.68
C
55
D
None of these
Correct Answer: Option B

Required average :

= 55 x 50 + 60 x 55 + 45 x 60
55 + 60 + 45
= 2750 + 3300 + 2700
160
= 8750
160
= 54.68
Question 10
The man of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is :

A
35.2
B
36.1
C
36.5
D
39.1
Correct Answer: Option C

Correct sum = (36 x 50 + 48 - 23)

                  = 1825

Correct mean = 1825 = 36.5
50

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