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Quants Questions : Number Series Set 9

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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 !!!

  1. 110, 90, 72, 56,  ?
    A)45
    B)42
    C)35
    D)30
    B)42
    Explanation :
    11^2 – 11 = 110
    10^2 – 10 = 90
    9^2 – 9 = 72
    8^2 – 8 = 56
    7^2 – 7 =42

  2. 210, 420,1050,3150, ?
    A)11025
    B)5690
    C)7654
    D)9876
    A)11025
    Explanation :
    210*2 = 420
    420*2.5 = 1050
    1050*3 = 3150
    3150*3.5 = 11025

  3. 165, 164, 163, 159, 151, ?
    A)156
    B)145
    C)142
    D)150
    C)142
    Explanation :
    165 – 1^2 = 164
    164 – 1^3 = 163
    163 – 2^2 = 159
    159 – 2^3 = 151
    151 – 3^2 = 142

  4. 658, 1315, 2627, 5249, ?
    A)11670
    B)8480
    C)7680
    D)10491
    D)10491
    Explanation :
    658*2-1 = 1315
    1315*2 – 3 = 2627
    2627*2 – 5 = 5249
    5249*2 – 7 = 10491

  5. 67, 68, 138, 417, 1672, ?
    A)8365
    B)8670
    C)6578
    D)5400
    A)8365
    Explanation :
    67*1+1 = 68
    68*2+2 =138
    138*3+3 =417
    417*4+4 = 1672
    1672*5+5 = 8365

  6. 1011, 980, 951, 924, 899, ?
    A)874
    B)876
    C)808
    D)796
    B)876
    Explanation :
    1011 – 31 = 980
    980 – 29 = 951
    951 – 27 = 924
    924 – 25 = 899
    899 – 23 = 876

  7. 123, 60.27, 21.70, 5.42, ?
    A)0.087
    B)2.7
    C)0.87
    D)1.67
    C)0.87
    Explanation :
    123*0.7*0.7 = 60.27
    60.27*0.6*0.6 = 21.70
    21.70*0.5*0.5 = 5.42
    5.42*0.4*0.4 = 0.87

  8. 321, 53.5, 21.4, 16.05, ?
    A)5.4
    B)13.6
    C)10.9
    D)21.4
    D)21.4
    Explanation :
    321*1/6 = 53.5
    53.5*2/5 = 21.4
    21.4*3/4 = 16.05
    16.05*4/3 = 21.4

  9. 11, 522,102.2,22, 456, ?
    A)98.7
    B)69.8
    C)86.8
    D)76.5
    C)86.8
    Explanation :
    522 – 11 = 511/5 = 102.2
    456 – 22 = 434/5 = 86.8

  10. 5640, 2820, 1410, 705, ?
    A)362.5
    B)345.7
    C)352.5
    D)367
    C)352.5
    Explanation :
    5640 – (5640/2) = 2820
    2820 – (2820/2) = 1410
    1410 – (1410/2) = 705
    705 – (705/2) = 352.5

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