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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