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 - 25 is the average of these number which are 40, 10, 25, 20, 35, x . find out the value of x?
Q 2 - 45 kg weight is the average of A, B and C. if the given condition of weight is 40 kg is the average of A and B while B and C have the average weight is 43 kg. Find out the weight of B?
A, B and C have total weight = 45*3 = 135 kg
A and B have total weight = 40*2 = 80 kg
B and C have total weight = 43*2 = 86 kg
∴ weight of B = (80+86- 135) = 31 kg.
Q 3 - 50 marks is the average of 5 students in English. What should be the right average if 48 marks read 84 by mistake.
Sum of the 5 students mark = (50*5)= 250
We find the actual sum of 5 students mark = (250+48- 84) = 214
Hence, the right average will be = 214/5 = 42.8
Q 4 - The students who leave the school find out the average of their marks if 50 is the average of their marks if 50 is the average of 28 students. Condition is given that 55 is the average marks of 20 students.
28 students have total marks = ( 28*50)= 1400
20 students have total marks = (55* 20) =1100
Total of 8 those students who leaves the school = 1400- 1100 = 300
Required average = 300/8 = 37.5
Q 5 - 40 year is the average of the class. 32 years is the average of the class if 12 new students also add in this class. Find out the number of students in the class?
x is the strength of the class.
40x+12*32 = 36* (x+12) ⇒ 4x =(432- 384) = 48 ⇒ x = 12
∴ original strength = 12
Q 6 - Drinks were done by 6 persons. Out of them 5 person paid 32 Rs. each, Rs. 80 more paid by the 6th person in the comparison of average expenditure of all. Find out the total amount paid by 6 persons?
if x is the average expenditure of 6 person.
(32*5)+(x+80)= 6x = 5x = (160+80) = 5x= 240 ⇒ x = 48
Total expenditure = 48*6 =288 Rs.
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?
Average after 11 innings = 36.
Therefore Required number of runs = (36 x 11) - (32 x 10) = 396 - 320 = 76.
Q 8 - A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half. The number of pupils in the class is?
Let there be z pupils in the class.
Total increase in marks = z x 1⁄2 = z⁄2
Therefore z⁄2 = (83 - 63) = z⁄2 = 20 z = 40.
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?
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 - The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is?
