Question
How many boxes are between U and
R? Study the following information carefully and answer the question given below: Nine boxes named M, N, O, P, Q, R, S, T and U are placed one above other but not necessarily in the same order. Only five boxes are placed between M and O. Q is placed immediate above O. Only three boxes are placed between Q and P. Number of boxes placed between M and P is same as between N and Q. R is placed below N, but not at bottom. Not less than four boxes are placed between Q and R. One box is placed between R and S. Box U is placed above box T.Solution
Only five boxes are placed between M and O. Q is placed immediate above O. Only three boxes are placed between Q and P. Following 5 cases are possible: 
Number of boxes placed between M and P is same as between N and Q. Not less than four boxes are placed between Q and R. One box is placed between R and S. Box U is placed above box T. All the cases except Case3 eliminate as they do not satisfy the third hint. 
Thus the final arrangement is as follows : 
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