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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 committee have 8 person. If 35 year and 45 year aged lady replaced by two men in that case the average of age become more 2 year in the comparison of old one. Find out the average age of two men?
Answer : D
Explanation
Age increase = (2*8) = 16 years. Total age of two lady who replaced = (35+45)= 80 Total age of two man = (80+16) =96 Average age of those men = 96/2 = 48. Hence, is 48 the required average age.
Q 4 - What should be the average speed of the train if first 12 min. travelled by train at a speed of 30km/hr and after that speed increased and with the speed of 45km/hr travelled for next 8 min?
Answer : A
Explanation
Total covered distance by train = (30*12/60+45* 8/60) = 12 km Total time taken by train to cover the distance = 12+8 = 20min = 1/3 hours. Required average speed = 12*3/1 = 36 km/hr.
Q 5 - In 11 innings a certain average has been made by a player. In the next innings he made 90 runs and his average have downfall with 5 runs. What will be the average of that player after 12 innings?
Answer : A
Explanation
If x is the average of run in 11 innings. Then, 11x+90 =(x-5)*12 ⇒ x= 150 Average run rate after 12th innings = (11x+90 )/12 =(11*150+90)/12= 145
Q 6 - 555 is the sum of 5 numbers. What should be the last numbers if average of two numbers is 75 and last 3 numbers have average of 115?
Answer : A
Explanation
If a and b is the last two numbers. then, (75*2)+115+(a+b)= 555 ⇒(a+b)= 555-365= 290 Average of last two numbers = 290/2 = 145
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?
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?
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 45 students in a class is 52kg. Five of them whose average weight is 48 kg leave the class and other 5 students whose average weight is 54kg join the class. What is the new average weight (in kg) of the class?
Answer - A
Explanation
Sum of the weights of the students after replacement. = [(52 x 45) - (48 x 5) + (54 x 5)] kg = 2370kg. Therefore, new Average = 2370⁄45kg = 532⁄3kg
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