Discussion
Which pairs are sitting opposite to each other ?
Answer: C
The pairs sitting opposite each other are CD and ts.
Number the seats 1 to 5 from west to east. The girls face north, so a girl's right is east; the boys face south, so a boy's left is east. C is just right of A and A is at an end, so A is in seat 1 and C in seat 2, and t, opposite C, is in seat 2. q is just to the left of s, so q sits one seat east of s, opposite E. B and r are diagonally opposite, at opposite ends of the two rows. If s and q took seats 4 and 5, E would be at seat 5 and B could not be at an end, so s is in seat 3, q and E in seat 4, r in seat 1 and B in seat 5. That leaves p in seat 5 and D in seat 3.
| Seat | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Boys (facing south) | r | t | s | q | p |
| Girls (facing north) | A | C | D | E | B |
C and D sit side by side in seats 2 and 3, directly facing t and s in the same seats. AC faces rt, not sp, and the pair CD does not face rt.
D also faces s and B faces p, but D and B are not neighbours (E sits between them), and neither are s and p (q sits between them), so 'DB and sp' are not pairs sitting opposite each other in the sense the question uses, of two neighbours facing two neighbours.
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