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Directions: In each of the following questions, there is a certain relationship between two given numbers on one side of :: and one number is given on another side of :: while another number is to be found from the given alternatives, having the same relationship with this number as the numbers of the given pair bear. Choose the best alternative.
Important for :
1
8 : 39 :: 72 : ?
» Explain it
C
The antecedent; 8 is first getting multiplied by 5 and then it is getting subtracted by 1 as 8 is the first multiple of 8. (8 = 8 × 1)

⇒ 8 × 5 – 1 = 39

Similarly,

We’ll first multiply 72 by 5 and then subtract 9 from it as 72 is the 9th multiple of 8. (72 = 8 × 9)

⇒ 72 × 5 – 9 = 351.

Hence, option C is correct.
2
123 : 4 :: 726 : ?
» Explain it
D
123 ⇒  12  = 4
3

Similarly,
 
726 ⇒  72  = 12
6
 


In this question, first two digits of the given number are divided by the third one.

Hence, option D is correct.
 

3
09 : 81  ::  04 : ?
» Explain it
A
9 ⇒ 92 = 81

Similalry,

4 ⇒ 42 = 16

Hence, option A is correct.

4
* 3 : 4  ::  6 * 5  :  ?
» Explain it
C
8 – 3 = 5; 5 – 1 = 4
 
Similarly;
 
6 – 5 = 1; 1 – 1 = 0
 
Alternatively,
 
8 × 3 = 24 : Its unit’s digit is 4.

6 × 5 = 30 : Its unit’s digit is 0.

Hence, option C is correct.
 
5
25 : 175 :: 32 : ?
» Explain it
D
25 ⇒ 25 × (2 + 5) = 175

Similarly,

32 ⇒ 32 × (3 + 2) = 160

Hence, option D is correct.