Direction: Read the given information and answer the following questions: 

21 persons work in bank at different post. The posts are in decreasing order i.e., Chairman, GM, Manager, AM, PO and Clerk. It is known that in any post the number of persons posted were one more than the number of persons posted in the immediate senior post. For example: If 4 person works as a PO then 5 persons work as a clerk. E works as a manager and is just senior to Z. C and G work at same post and were senior to E. F, Q and R work at same post and were junior to Z. A is just junior to W but just senior to R. P, T and Y work at same post but not with A. V is junior to Z but senior to J. K and O work at same post but does not work as a clerk. S does not work along with U and P. D is senior to M and junior to S. U and B work at same place.