Question
Which box is placed immediately below box
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. 
230 192 172 ? 122 100
...What value should come in the place of (?) in the following number series?
64, 80, 104, ?, 176, 224
97, 106, ?, 195, 411, 460
What will come in place of the question mark (?) in the following series?
29, 42, ?, 95, 135, 184
Find the missing term:
2, 6, 15, 31, 56, ?
32   48   96   ?   720   2520
82, 98, 130, 178, 242, ?
4 10 ? 62.5 156.25 390.625
...140, 146, 170, 224, ?, 470
7 47 ? 223 359 527
...
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