General Intelligence : Number Analogy for PA/SA 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. 6 : 18 : : 4 : ?
A. 2
B. 6
C. 8
D. 16

Answer : C.8
Justification: The relationship is x : x2/2.

2. 21 : 3 : : 574 : ?
A. 23
B. 82
C. 97
D. 113

Answer: B . 82
Justification: The relationship is 7x : x.

3. 1 : 1 : : 25 : ?
A. 26
B. 125
C. 240
D. 625

Answer: D . 625
Justification: The relationship is x : x2.

4. 121 : 12 : : 25 : ?
A. 1
B. 2
C. 6
D. 7

Answer: C . 6
Justification: The relationship is x2 : (x + 1).

5. 42 : 20 : : 64 : ?
A. 31
B. 32
C. 33
D. 34

 Answer: A . 31
 Justification: The relationship (2x + 2) : x.

6. 7528 : 5306 : : 4673 : ?
A. 2367
B. 2451
C. 2531
D. None of these

Answer: B . 2451
Justification:The relationship is x : (x - 2222).

7. 25 : 37 : : 49 : ?
A. 41
B. 56
C. 60
D. 65

Answer: D . 65
Justification:The relationship is x2 : (x + 1)2 + 1.

8. 25 : 125 : : 36 : ?
A. 180
B. 206
C. 216
D. 318

Answer: C . 216
Justification: The relationship is x2 : x3.

9. 14 : 9 : : 26 : ?
A. 12
B. 13
C. 15
D. 31

Answer: C . 15
Justification: The relationship is (2x - 4) : x.

10. 8 : 28 : : 27 : ?
A. 8
B. 28
C. 64
D. 65

Answer: D . 65
Justification: The relationship is x3 : (x + 1)3 + 1.