Aptitude - Averages Online Quiz


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Following quiz provides Multiple Choice Questions (MCQs) related to Averages. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 1 - Find out the average of A and B if the given value of 16A+ 16B = 48

A - 1.5

B - 2

C - 5.3

D - 7.4

Answer : A

Explanation

16a+16b = 48 ⇒ 16(a+b) = 48 ⇒ (a+b) = 3
So, we  have a and b average  is  (a+b)/2 = 3/2 = 1.5

Q 2 - 23 is the average of 3 friends if we add 1 more person then the value of average will be same or no change. Find out the age of the new person?

A - 21 years

B - 20 years

C - 52 years

D - 23 years

Answer : D

Explanation

3 friends have the sum of the ages = (3*23)= 69 ...(i)
4 friend have the sum of the ages = (4*23)=92 ...(ii)
Difference between  the (i) and (ii)  is the age of the new person.  We find that the age of the  new person is (92-69)= 23 years.

Q 3 - Find out the total employee's quantity if the given condition such that Rs. 8500 is the average salary of workers. 10000 Rs. is the average monthly salary of 7 technicians and remaining worker has Rs. 7800 average salary of the month.

A - 34

B - 22

C - 26

D - 80

Answer : B

Explanation

If x employees working in firm . then  (7* 10000)+7800(x-7 )= 8500
= 70000 +7800x-546 00 =8500x  ⇒ 700x = 15400 ⇒ x = 22
We find that 22 employees are working in the firm.

Q 4 - Before the period of 10 years, 24years is the average of 4 memberís family. After two children born, the average age of the family no change if 2 years is the age difference between 2 children then what should be the youngest child age?

A - 3 years

B - 2 years

C - 5 years

D - 7 years

Answer : A

Explanation

x is the age of the youngest child.
Then, elder son child age = (x+2) years.
At the present day average age of 6 members = 24 years.
At the present day , some of the ages of 6 members = (24*6)= 144 years.
(24*4)+(10*4) +x+(x+2) =144 ⇒ 2x = 6 ⇒ x= 3
At the present time the youngest child have 3 year age old.

Q 5 - What should be the largest number if first number is the half of the second number and third number is 1/3 of the second number? 44 is the average of three numbers?

A - 72

B - 62

C - 52

D - 42

Answer : A

Explanation

if x is the third number , then second number = 3x  ∴ first number = 3x/2
Average =1/3 (3x/2+3x+x) ⇒  (11x/6) =44  ⇒ 11x=264 ⇒ x = 24
Hence, the second number (24*3)=72  is the largest number.

Q 6 - 450 is the sum of four numbers and 50 is the mean. Find out the new mean if 100 more numbers included?

A - 15

B - 67

C - 55

D - 45

Answer : C

Explanation

If the number  of numbers be A. then,
50A= 450 ⇒ A = 9

Q 7 - 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 - 70

C - 4

D - 76

Answer - D

Explanation

Average after 11 innings = 36. 
Therefore Required number of runs = (36 x 11) - (32 x 10) = 396 - 320 = 76.

Q 8 - The average age of 15 students of a class is 15 years. Out of these, the average age of 5 5 students is 14 years and that of the other 9 students is 16 years. The age of the 15th student is?

A - 11

B - 14

C - 15

D - 16

Answer - A

Explanation

Age of the 15th student = [15 x 15 - (14 x 5 + 16 x 9)] = (225 - 214) = 11 years.

Q 9 The average weight of 8 persons increases by 2.5kg when a new person comes in place of one of them weighing 65kg . what might be the weight of the new person?

A - 85

B - 75

C - 75.5

D - 80

Answer - A

Explanation

Total weight increased = (8 x 2.5) kg = 20kg 
Weight of new person = (65 + 20) kg = 85kg.

Q 10 - A crickter whose bowling average is 12.4 runs per wicket takes 5 wickets for 26 runs and thereby decreases his average by 0.4. The number of wickets taken by him till the last match was:?

A - 64

B - 85

C - 72

D - 80

Answer - B

Explanation

Let the number of wickets taken till the last match be z. Then, 
12.4z + 26z + 5 = 12 
 = 12.4z + 26 = 12z + 60 = 0.4z = 34 

z = 340.4 
z = 3404 = 85

aptitude_averages.htm

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