Quants Questions : Number Series Set 9

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
   
   Answer

   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
   
   Answer

   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
   
   Answer

   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
   
   Answer

   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
   
   Answer

   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
   
   Answer

   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
   
   Answer

   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
   
   Answer

   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
   
   Answer

   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
    
    Answer

    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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