Question
What is the position of O with respect to
D? Study the following information carefully and answer the below questions. There are three rows Row1, Row2 & Row3. Row1 is immediate north of row2 and Row3 is immediate south of Row2. Eight person sits in row2 and 4 person sits in each row1 and row3. First four person from left end of row2 sits facing person in row1, similarly first four person from right end of row2 sits facing person from row3. N sits third to right of D, who sits facing Q. L sits third to right of K. M and K doesn’t sit together. Neither L nor K sits at end of the row. Y neither sits adjacent to Q nor sits adjacent to N. No person sits left of Q. Z sits in any row north of O’s row. The one who sits facing Y, sits second to right of M. X sits immediate left of J, who sits facing south. K sits facing R, who sits immediate right of G. One person sits between P and F, who sits facing A.Solution
We have: N sits third to right of D, who sits facing Q. No person sits left of Q. That means, in case (1) Q sits at left end of Row1, in case (2) Q sits left end of Row3. L sits third to right of K. Neither L nor K sits at end of the row. K sits facing R, who sits immediate right of G. That means, in case (1a) L sits immediate left of D, in case (1b) L sits immediate right of D, in case (2a) L sits immediate left of D, in case (2b) L sits immediate right of D. Based on above given information we have:  Case-2a 
 Again, we have: The one who sits facing Y, sits second to right of M. M and K doesn’t sit together. Y neither sits adjacent to Q nor sits adjacent to N. That means, in case (1a) M sits immediate right of Q, in case (1b) M sits immediate left of N, in case (2a) M sits immediate right of M, in case (2b) M sits immediate left of N. One person sits between P and F, who sits facing A. That means, in case (1b) A sits immediate right of R, in case (2b) A sits immediate right of A, case (1a) & case (2a) are not valid. X sits immediate left of J, who sits facing south. That means, in case (2b) X sits immediate right of Y, case (1b) is not valid. Z sits in any row north of O’s row. That means, in case (2b) Z sits immediate left of Y and O sits immediate left of L. Based on above given information we have final arrangement as follows: 
 Case (1a) & case (2a) are not valid as one person sits between P and F, who sits facing A, case (1b) is not valid as X sits immediate left of J, who sits facing south.
The sum of two numbers is 25 and their difference is 15. The ratio of the numbers is:
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