Question
Among five friends B, C, D, E and F each studies in a
different standard, viz, 2nd, 5th, 8th, 10th and 12th. C studies in a standard which is an even number. D is F’s senior but does not study in 12th standard. Only three students are senior to B. C is senior to B but junior to D. In which standard does F study?Solution
Only three students are senior to B. C is senior to B but junior to D. It means B studies in 5th standard. C studies in a standard which is an even number. C studies either in 8th or 10th standard. D is F’s senior but does not study in 12th standard. D does not study in 12th standard it means D studies in 10th standard. D is F’ senior that means F studies in 2nd standard. E is the one who studies in 12th standard. So, case 2 will get discarded. 
Final arrangement as shown below: 
What will come in place of the question mark (?) in the following series?
75, 219, 388, ?, 809, 106516.12 × 15.94 + 654.92 – 344.83 = ?× 5.95
660, 653, 639, 618, 590, ?
120, 126, 138, 162, ?, 306
11          20          ?             64          112        192
...Find the missing term in the series:
2, 5, 11, 23, 47, ?
580 557 528 497 ? 419
17, 38, 123, 508, ?, 15426
What will come in place of the question mark (?) in the following series?
55, 176, 320, ?, 685, 910
161Â Â Â Â 173Â Â Â Â Â Â 191 Â Â Â Â Â Â 215Â Â Â Â Â Â 245 Â Â Â Â Â Â ?
...
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