This document contains a quiz with 15 multiple choice questions about averages, ages, and odd numbers out. It provides the question, possible answers, and an explanation for the answer. The quiz is authored by Dr. K. Karthikeyan, an Associate Professor of Commerce and Dean/Controller of Examinations at Vivekananda College in Tamil Nadu, India. His contact information is included at the top.

1. 1
Naren Quiz – Series 14
Dr.K.Karthikeyan
Associate Professor of Commerce
Dean and Controller of Examinations
Vivekananda College
Tiruvedakam West – 625 234
Mobile: +91-9865074994
Email: karthikeyan.madurai@gmail.com

2. AVERAGE
1) The average monthly income of P
and Q is Rs. 5,050. The average monthly
income of Q and R is Rs. 6,250 and the
average monthly income of P and R is
Rs. 5,200. What is the monthly income
of P?
a. Rs. 3,500 b. Rs.4,000
c. Rs. 4, 050 d. Rs.5,000
Answer: Option B

3. Explanation
Let P, Q and R represent their respective
monthly incomes. Then, we have:
P + Q = (5050 x 2) = 10100 .... (i)
Q + R = (6250 x 2) = 12500 .... (ii)
P + R = (5200 x 2) = 10400 .... (iii)
Adding (i), (ii) and (iii), we get: 2(P + Q +
R) = 33000 or P + Q + R = 16500 .... (iv)
Subtracting (ii) from (iv), we get P = 4000.
P's monthly income = Rs. 4000.

4. AVERAGE
2) The average age of husband, wife
and their child 3 years ago was 27
years and that of wife and the child 5
years ago was 20 years. What is the
present age of the husband?
a. 35 years b. 40 years
c. 50 years d. 30 years
Answer: Option B

5. Explanation
Sum of the present ages of husband,
wife and child = (27 x 3 + 3 x 3) years
= 90 years.
Sum of the present ages of wife and
child =
(20 x 2 + 5 x 2) years = 50 years.
Husband's present age = (90 - 50) = 40
years.

6. AVERAGE
3) A car owner buys petrol at Rs.7.50,
Rs. 8 and Rs. 8.50 per litre for three
successive years. What approximately is
the average cost per litre of petrol if he
spends Rs. 4000 each year?
a. Rs.7.98 b. Rs.8
c. Rs.8.50 d. Rs.9
Answer: Option A

7. AVERAGE
4) The average weight of A, B and C
is 45 kg. If the average weight of A
and B is 40 kg and that of B and C is
43 kg, then, What is the weight of B?
a. 17 kg. b. 20 kg.
c. 26 kg. d. 31 kg.
Answer: Option D

8. Explanation
Let A, B, C represent their respective
weights. Then, we have:
A + B + C = (45 x 3) = 135 .... (i)
A + B = (40 x 2) = 80 .... (ii)
B + C = (43 x 2) = 86 ....(iii)
Adding (ii) and (iii), we get: A + 2B + C
= 166 .... (iv)
Subtracting (i) from (iv), we get: B = 31.

9. AVERAGE
5) A library has an average of 510
visitors on Sundays and 240 on other
days. What is the average number of
visitors per day in a month of 30 days
beginning with a Sunday?
a. 250 b. 276
c. 280 d. 285
Answer: Option D

10. Explanation
Since the month begins with a
Sunday, to there will be five Sundays
in the month.
Required average = 510 x 5 + 240 x 25
30
= 8550
30
= 285

11. AGE
6) The sum of the present ages of a
father and his son is 60 years. Six
years ago, father's age was five times
the age of the son. What will be age
of son after 6 years?
a. 12 years b. 14 years
c. 18 years d. 20 years
Answer: d

12. Explanation
Let the present ages of son and father
be x and (60 -x) years respectively.
Then, (60 - x) - 6 = 5(x - 6)
54 - x = 5x - 30
6x = 84
x = 14.
Son's age after 6 years = (x+ 6) = 20
years.

13. AGE
7) At present, the ratio between the
ages of Arun and Babu is 4 : 3. After
6 years, Arun's age will be 26 years.
What is the age of Babu at present?
a. 12 years b. 15 years
c. 19 years d. 21 years
Answer: b

14. Explanation
Let the present ages of Arun and Babu
be 4x years and 3x years respectively.
Then,
4x + 6 = 26 4x = 20
x = 5.
Babu’s age = 3x = 15 years.

15. Odd Man Out
8) 396, 462, 572, 396, 427, 671, 264
A.396 B.427
C.671 D.264
Answer: Option B
(In each number except 427, the
middle digit is the sum of other two)

16. Odd Man Out
9) 6, 9, 15, 21, 24, 28, 30
A.28 B.21
C.24 D.30
Answer: Option A
( Each of the numbers except 28, is a
multiple of 3)

17. Odd Man Out
10) 1, 4, 9, 16, 23, 25, 36
A.9 B. 23
C. 25 D. 36
Answer: Option B
(Each of the numbers except 23, is
perfect square)

18. Odd Man Out
11) 10, 14, 16, 18, 21, 24, 26
A.26 B.24
C.21 D.18
Answer: Option C
(Each of the numbers except 21 is an
even number)

19. Odd Man Out
12) 331, 482, 551, 263, 383, 242, 177
A. 263 B. 383
C. 242 D. 177
Answer: Option B
(In each number except 383, the
product of first and third digits is the
middle one)

20. Odd Man Out
13) 835, 734, 642, 751, 853, 981, 532
A. 751 B. 853
C. 981 D. 532
Answer: Option A
(In each number except 751, the
difference of third and first digit is the
middle one)

21. Odd Man Out
14) 41, 43, 47, 53, 61, 71, 73, 81
A. 61 B. 71
C. 73 D. 81
Answer: Option D
(Each of the numbers except 81 is a
prime number)

22. Odd Man Out
15) 3, 5, 7, 12, 17, 19
A.19 B. 17
C. 5 D. 12
Answer: Option D
(Each of the numbers is a prime
number except 12)

23. THANK YOU