Average MCQs for Competitive Examination
Solve the following problems.
Q. 21
If I travel by bus, I reach my office 15 min late, and if I travel by car, I reach 10 min early. If the distance between my home and my office is 25 km, then the difference of the reciprocals of average speeds of the bus, in second per meter is:
(A) 3/20
(B) 3/50
(C) 3/25
(D) 3/10
Answer: (B) 3/50
Explanation:
Q. 22
The average of a number and its reciprocal is 4. The average of its cube and its reciprocal is equal to
(A) 244
(B) 288
(C) 142
(D) 156
Answer: (A) 244
Explanation:
Q. 23
The average of 1088 real numbers is zero. At most how many of them can be negative?
(A) 88
(B) 100
(C) 1087
(D) 544
Answer: (C) 1087
Explanation:
Q. 24
A boy bought 50 chocolates for Rs 1000. If the average price of 30 chocolates is Rs 25, then what is the average price (in Rs) of the remaining chocolates?
(A) 10
(B) 12.5
(C) 15
(D) 17.5
Answer: (B) 12.5
Explanation:
Q. 25
Find the average of all prime numbers between 20 and 50
(A) 35.857
(B) 35.657
(C) 34.857
(D) 36.657
Answer: (A) 35.857
Explanation:
Q. 26
Among four students sitting in a row, the average age of the last three students is 20 years and the average age of the first three students is 21 years. If the age of the first student is 26 years, then what is the age (in years) of the last student?
(A) 23
(B) 37
(C) 24
(D) 29
Answer: (A) 23
Explanation:
Q. 27
The average of 6 consecutive integers is 15/2. What is the average of the last three integers?
(A) 8
(B) 9
(C) 17/2
(D) 7
Answer: (B) 9
Explanation:
Q. 28
What is the average of the first 39 even numbers?
(A) 39
(B) 40
(C) 20
(D) 68
Answer: (B) 40
Explanation:
Q. 29
If 31x + 31y = 403, then what is the average of x and y?
(A) 3.5
(B) 5
(C) 6.5
(D) 13
Answer: (C) 6.5
Explanation:
Q. 30
What is the average of all the one-digit, two-digit, and three-digit natural numbers?
(A) 300
(B) 500
(C) 1000
(D) 1250
Answer: (B) 500
Explanation:
Q. 31
In a committee there are 25 members. If two members whose ages are 64 years and 40 years are replaced by the two new members, then the average age of 25 members is decreased by 2 years. What is the average age (in years) of the new members?
(A) 27
(B) 32
(C) 44
(D) 38
Answer: (A) 27
Explanation:
Q. 32
A person bought 100 cars for Rs 40000. If the average price of 60 cars is Rs 500, then what will be the average price (in Rs) of remaining cars?
(A) 200
(B) 250
(C) 300
(D) 350
Answer: (B) 250
Explanation;
Q. 33
A boy bought 50 chocolates for Rs 1000. If the average price of 30 chocolates is Rs 25, then what is the average price (in Rs) of the remaining chocolates?
(A) Rs 83 lakhs
(B) Rs 79 lakhs
(C) Rs 77 lakhs
(D) Rs 81 lakhs
Answer: (D) Rs 81 lakhs
Explanation:
Q. 34
The average revenues of 9 consecutive years of a company is Rs 80 lakhs. If the average of the first 5 years is Rs 75 lakhs and that of the last 5 years is Rs 87 lakhs, find the revenue for the 5th year.
(A) Rs 90 lakhs
(B) Rs 92 lakhs
(C) Rs 88 lakhs
(D) Rs 86 lakhs
Answer: (A) Rs 90 lakhs
Explanation:
Q. 35
In a class of 60 students, there are 30 girls. The average weight of these girls is 58 Kg and the average weight of the full class is 63 kgs. What is the average weight of the boys of the class?
(A)67
(B) 66
(C) 68
(D) 65
Answer: (C) 68
Explanation:
Q. 36
The average revenues of 9 consecutive years of a company is Rs 80 lakhs. If the average of the first 5 years is Rs 75 lakhs and that of the last 5 years is Rs 87 lakhs, find the revenue for the 5th year.
(A) Rs 90 lakhs
(B) Rs 92 lakhs
(C) Rs 88 lakhs
(D) Rs 86 lakhs
Answer: (A) Rs 90 lakhs
Explanation:
Q. 37
A factory buys 7 machines. 2 Machine A, 2 Machine B and rest Machine C. Prices of the machines are Rs 95000, Rs 75000 and Rs 43000 respectively. Calculate the average cost of these machines?
(A) 71000
(B) 67000
(C) 75000
(D) 65500
Answer: (B) 67000
Explanation:
Q. 38
Among the three numbers, the first is twice the second and thrice the third, If the average of three numbers is 517, then what is the difference between the first and the third number?
(A) 564
(B) 759
(C) 485
(D) 799
Answer: (A) 564
Explanation:
Q. 39
To cover a distance of 315 km in 2.8 hours what should be the average speed of the car in meters/second?
(A) 46
(B) 50
(C) 36
(D) 48
Answer: (A) 46
Explanation:
Q. 40
The average revenues of 11 consecutive years of a company is Rs 77 lakhs. If the average of the first 6 years is Rs 72 lakhs and that of the last 6 years is Rs 84 lakhs, What is the revenue for the Sixth year?
(A) Rs 91 lakhs
(B) Rs 87 lakhs
(C) Rs 85 lakhs
(D) Rs 89 lakhs
Answer: (D) Rs 89 lakhs
Explanation: