If HORSE is written as IPQRF, how will CAMEL be written?
If HORSE is written as IPQRF, how will CAMEL be written?
Comparing HORSE to IPQRF letter by letter, the shift pattern for the 5 letters is +1, +1, -1, -1, +1. Applying the same shift pattern to CAMEL: C+1=D, A+1=B, M-1=L, E-1=D, L+1=M, giving DBLDM.
Re-check your working by substituting the answer back into the original question.