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Aptitude Questions: Number Series Set 39

Quantitative Aptitude

Hello Aspirants. Welcome to Online Quantitative Aptitude Section in AffairsCloud.com. Here we are creating question sample in Number Series, which is common for all the competitive exams. We have included Some questions that are repeatedly asked in bank exams !!!

Directions(1-10) : In these questions, a number series is given. Find out the missing number.

  1. 18 10 8 9 11.5 ?
    A. 14.75
    B. 10.75
    C. 18.75
    D. 19.75
    E. 20.75
    Answer – A. 14.75
    Explanation :
    18 / 2 + 1 = 10
    10 / 2 + 3 = 8
    8 / 2 + 5 = 9

  2. 6 4 6 12 22 ? 
    A. 26
    B. 36
    C. 86
    D. 66
    E. 46
    Answer – B. 36
    Explanation :
    6 / 2 + 1² = 4
    4 / 2 + 2² = 6
    6 / 2 + 3² = 12….

  3. 20 39 74 ? 262 499 
    A. 146
    B. 169
    C. 166
    D. 139
    E. 129
    Answer – D. 139
    Explanation :
    20*2 – 1² = 39
    39*2 – 2² = 74
    74*2 – 3² = 139…..

  4. 15 32 60 122 240 ?
    A. 362
    B. 488
    C. 482
    D. 364
    E. 382
    Answer – C. 482
    Explanation :
    15 * 2 + 2 = 32
    32 * 2 – 4 = 60
    60 * 2 + 2 = 122; 122 * 2 – 4 = 240…

  5. 14 12 28 78 320 ?
    A. 1450
    B. 1590
    C. 1440
    D. 1810
    E. 1690
    Answer – B. 1590
    Explanation :
    14 * 1 – 2 = 12
    12 * 2 + 4 = 28
    28 * 3 – 6 = 78; 78 * 4 + 8 = 320; 320 * 5 – 10 = 1590

  6. 31, 16, 10, 13, 38.5, ?
    A. 167.25
    B. 177.25
    C. 147.25
    D. 174.25
    E. 185.25
    Answer – C. 147.25
    Explanation :
    31 / 2 + 0.5 = 16
    16 / 2 + 2 = 10
    10 / 2 + 8 = 13
    13 / 2 + 32 = 38.5…..

  7. 25 25 37 57 113 ?
    A. 202
    B. 207
    C. 185
    D. 195
    E. 190
    Answer – C. 185
    Explanation :
    25 + 1² – 1 = 25
    25 + 3² + 3 = 37
    37 + 5² – 5 = 57…..

  8. 18, 20, 40, 70, 142 ?
    A. 232
    B. 254
    C. 188
    D. 196
    E. 240
    Answer – A. 232
    Explanation :
    18 + 2² – 2 = 20; 20 + 4²+ 4 = 40; 40 + 6² – 6 = 70 ….

  9. 720 520 336 222 120 ?
    A. 78
    B. 68
    C. 76
    D. 56
    E. 58
    Answer – B. 68
    Explanation :
    9³ – 9 = 720
    8³ + 8 = 520
    7³ – 7 = 336
    6³ + 6 = 222….

  10. 72, 72, 42, 42, 20, ?
    A. 30
    B. 40
    C. 50
    D. 20
    E. 10
    Answer – D. 20
    Explanation :
    9² – 9 = 72
    8² + 8 = 72
    7² – 7 = 42
    6² + 6 = 42





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