Question
How many boxes are there between N and R?
Study the following information carefully and answer the question given below: Seven boxes M, N, O, P, Q, R, S are arranged one above another. Only two boxes are placed above box P. Only one box is placed between box S and P. As many as boxes are placed between box S and Q as between box Q and M. Three boxes are placed between box N and O. N is placed above O.Solution
Only two boxes are placed above box P. Only one box is placed between box S and P. Three boxes are placed between box N and O. N is placed above O. 
As many as boxes are placed between box S and Q as between box Q and M. Clearly, we can’t place S, Q and M fulfilling the given condition in Case 2. However, in Case 1 we get the arrangement as follows Evidently, R will be filling the vacant position in Case 1. 
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