Number Analogy : Postal/ Sorting assistant Examination 2015

Number Analogy for Postal Assistant / Sorting Assistant Examination 2015

Number analogy section deals with two types of questions:
I. Choosing a similarly related pair as the given number pair on the basis of the relation between the numbers in each pair.
II. Choosing a number similar to a group of numbers on the basis of certain common properties that they possess.

1. 583 : 293 : : 488 : ?
A. 291
B. 378
C. 487
D. 581

Answer: B . 378 
Justification: Sum of digits of the first number is 2 more than the sum of digits of the second number.

2.7 : 56 : : 9 : ?
A. 63
B. 81
C. 90
D. 99

Answer: C . 90 
Justification: The relationship is x : x(x + 1).

3. 9 : 8 : : 16 : ?
A. 27
B. 18
C. 17
D. 14

Answer: A . 27 
Justification:
The relationship is x^ : (x -1)^+1.
Now, 16 = 42.
So, required number \ (4 – 1)2+1= 33 = 27.

4. 8 : 81 : : 64 : ?
A. 125
B. 137
C. 525
D. 625

Answer: D . 625 
Justification:
The relationship is x^ : (x + 1)(^+1).
Now, 64 = 43
So, required number \ (4 + 1)(3+1) = 53 = 625.

5. 17 : 52 : : 1 : ?
A. 3
B. 4
C. 5
D. 51

Answer: B . 4 
Justification: The relationship is x : (3x + 1).

6. 20 : 11 : : 102 : ?
A. 49
B. 52
C. 61
D. 98

Answer: B . 52
Justification: The relationship is 2x : (x + 1).

7. 9 : 80 : : 100 : ?
A. 901
B. 1009
C. 9889
D. 9999

Answer: D . 9999 
Justification: The relationship is x : (x2 - 1).

8. 12  :  144
A. 22 : 464
B. 20 : 400
C. 15 : 135
D. 10 : 140

Answer: B . 20 : 400 
Justification:The relationship is x : x2.

9. 27 : 9
A. 64 : 8
B. 125 : 5
C. 135 : 15
D. 729 : 81

Answer: D . 729 : 81
 Justification:The relationship is x3 : x2.

10. 5 : 35
A. 7 : 77
B. 9 : 45
C. 11 : 55
D. 3 : 24

Answer: A . 7 : 77 
Justification:The first number is multiplied by the next prime number to obtain the second number.