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Aptitude - Averages Online Quiz
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.
Q 1 - Find the average of the numbers which are as follows : 15, 5, 0, 12, 8
Answer : C
Explanation
Average required = (15+5+0+12+8)/5 = 40/5 = 8
Q 2 - 44 is the average of 100 numbers. If we add 4 new numbers in 100 numbers then average will be 50 then what should be the average value of new 4 numbers?
Answer : B
Explanation
The value of 100 number= (44*100) = 4400 The value of 104 number = ( 50*104)= 5200 ∴ value of 4 new number = 5200- 4400 = 800 Then the average value of the 4 numbers = 800/4 = 200
Q 3 - A class has 24 students. If 18 year old boys left the school and one new boy join the school in that situation the average decrease by 1 month. Find out the age of new boy?
Answer : A
Explanation
Downfall in the total age =( 24*1 )= 24 months =2 years The age of the new boy = 18- 2 = 16 years.
Q 4 - Find out the average speed of the journey if with the speed of 6km/hr covers half distance and remaining half covers by the speed of 3 km/hr.
Answer : B
Explanation
Average speed = 2xy / (x+y)km/hr = 2*6*3/ (6+3)km/hr = 4km/hr
Q 5 - With the average of 12.4 takes 5 wickets by use of 26 run. A player has 0.4 downfalls in his average. What should be the number of wicket taken by him before the last match played?
Answer : A
Explanation
x is the number of wickets taken a player before the last match played. Then, (12.4x+26)/(x+5) =12 ⇒ 12.4x+26 =12x+60 ⇒ 0.4x =34 ⇒ 0.4x =34 ⇒ x= 34/0.4 ⇒ x =340/4 = 85. Wickets required = 85.
Q 6 - Find out the value of x1 if 16 is the average of x1,x2,x3 and x4. Here 23 is the half sum of x2, x3 and x4.
Answer : C
Explanation
(x1+x2+x3+x4 /4) =16 ⇒ (x1+x2+x3+x4)= 64 1/2 (x2+x3+x4) =23 ⇒ (x2+x3+x4)= 46 Value of x1 = (64-46) =18
Q 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?
Answer - B
Explanation
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 Therefore Required average = 9.2⁄2 = 4.6.
Q 8 - The average temperature of the town in the first four days of a month was 58 degrees. The average for the second, third, fourth and fifth days was 60 degrees. If the temperatures of the first and fifth days were in the ratio 7:8, then what is the temperature on the fifth day?
Answer - A
Explanation
Sum of temperature on 1st, 2nd, 3rd and 4th days = (58 x 4) = 232 degrees ...(i) Sum of temperature on 2nd , 3rd 4th and 5th days = (60 x 4) = 240 degrees ...(ii) Subtracting (i) from (ii) we get: Temp on 5th day - temp on 1st day = 8 degrees Let the temperature on 1st and 5th days be 7z and 8z degrees respectively. Then, 8z - 7z = 8 or z = 8. Therefore Temperature on 5th day = 8z = 64 degrees.
Q 9 - The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team?
Answer - B
Explanation
Let the average age of the whole team be z years. Therefore 11z - (26 + 29) = 9 (z - 1) = 11z - 9z = 46 = 2z = 46 = z = 23 So, average age of team is 23 years.
Q 10 - In an examination, a pupil's average marks were 63 per paper. If he had obtained 20 more marks for his Geography paper and 2 more marks for his history paper, his average per paper would have been 65. How many papers were there in the examination?
Answer - C
Explanation
Let the number of papers be z. Then, 63z + 20 + 2 = 65z 2z = 22 or z = 11