DSSSB · Reasoning

In the following number-pairs, the second number has been obtained by performing some mathematical operations on the first number. What numbers should come in place of X and Y so that the pattern followed by the two numbers on the left of :: is the same as the pattern followed by the numbers on the right of ::? (Note: Operations should be performed on whole numbers, without breaking the numbers into their component digits. Take 13 for example - Operations on 13 Like adding/subtracting/multiplying etc. can be done on 13. Breaking 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

  1. X = 2 ; Y = 9
  2. X = 2 ; Y = 7
  3. X = 4 ; Y = 9
  4. X = 2 ; Y = 5
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