Average Quants MCQs with Answer - Exercise I

Ques 1 Average


The average age of 14 girls and their teacher's age is 15 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?

A 32 years
B 30 years
C 29 years
D 35 years

Let's assume that the teacher's age is x. The total age of the 14 girls is 14 * 15 years = 210 years.
So, the total age of the 14 girls and the teacher is 210 + x years.
If the teacher's age is excluded, the average reduces by 1, so the average age of the 14 girls is 15 - 1 = 14 years.
So, the total age of the 14 girls is 14 * 14 years = 196 years.
Now, we can use the equation:
(14 * 14 + x) / 15 = 15
Expanding and solving for x, we get:
196 + x = 15 * 15
196 + x = 225
x = 225 - 196
x = 29
So, the teacher's age is 29 years, and the correct answer is c) 29 years.

Ques 2 Average


There are 100 students in 3 sections A, B, and C of a class. The average mark of all the 3 sections was 84. The average of B and C was 87.5 and the average mark of A is 70. The number of students in A was

A 20
B 25
C 35
D 30

Ques 3 Average


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 29.5 Kg
B 35 Kg
C 32 Kg
D 31 Kg

Ques 4 Average


The average weight of five persons sitting in a boat is 38 kg. The average weight of the boat and the persons sitting in the boat is 52kg. What is the weight of the boat ?

A 232 Kg
B 242 Kg
C 122 Kg
D 218 Kg

Ques 5 Average


The average of two numbers is 8 and the average of other three numbers is 3. The average of the five numbers is

A 3
B 6
C 5
D 2

Ques 6 Average


The average of 11 results is 50. If the average of the first six results is 49 and that of the last six is 52, the sixth no. is

A 50
B 56
C 52
D 48

Ques 7 Average


The average age of six members of a family is 40 years. If the age of a guest is included, then the average age increases by 12.5%. What is the age (in years) of the guest?

A 75
B 79
C 45
D 95