Question 36

Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.
75 : 63 :: 189 : 171 :: 55 : ?

Solution

75 : 63

Second number = first number - sum of the digits of the first number

= 75 - (7+5)

= 75 - 12

= 63

189 : 171

Second number = first number - sum of the digits of the first number

= 189 - (1+8+9)

= 189 - 18

= 171

55 : ?

Second number = first number - sum of the digits of the first number

= 55 - (5+5)

= 55 - 10

= 45

Hence '45' will come in place of the question mark.

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Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.75 : 63 :: 189 : 171 :: 55 : ?