In a mixed letter coding system, if the word 'CAT' is coded as 'XZY', and 'DOG' is coded as 'ABC', what is the code for 'AT' if 'A' is coded as 'X' and 'T' is coded as 'Y'?
In a circular seating arrangement, A is sitting to the immediate left of B, and C is sitting to the immediate right of A. If D is sitting opposite to B, who is sitting to the immediate left of C?