Aptitude Questions: Number Series Set 26

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Questions Penned by Yogit

1. 40 42 21 23 11.5 ?
   a) 11.5
   b) 13.5
   c) 17.5
   d) 52
   e) None of these
   
   Answer & Explanation

   Answer – b) 13.5
   Explanation :
   40 + 2 = 42
   42 ÷ 2 = 21
   21 + 2 = 23
   23 ÷ 2 = 11.5
   11.5 + 2 = 13.5
   
   
   
2. 17 89 154 210 255 ?
   a) 237
   b) 247
   c) 267
   d) 287
   e) None of these
   
   Answer & Explanation

   Answer – d) 287
   Explanation :
   17 + (81 – 9) = 89
   89 + (81 – 16) = 154
   154 + (81 – 25) = 210
   210 + (81 – 36) = 255
   255 + (81 – 49) = 287
   
   
   
3. 10 25 42 63 92 ?
   a) 127
   b) 137
   c) 147
   d) 157
   e) None of these
   
   Answer & Explanation

   Answer – b) 137
   Explanation :
   10 + 15 = 25
   25 + 17 = 42
   42 + 21 = 63
   63 + 29 = 92
   92 + 45 = 137
   
   
   
4. 12 34 98 286 ?
   a) 832
   b) 842
   c) 852
   d) 864
   e) None of these
   
   Answer & Explanation

   Answer – b) 842
   Explanation :
   12*3 – 2 = 34
   34*3 – 4 = 98
   98*3 – 8 = 286
   286*3 – 16 = 842
   
   
   
5. 100 100 50 12.5 ?
   a) 2.5625
   b) 1.5625
   c) 3.5625
   d) 4.5625
   e) None of these
   
   Answer & Explanation

   Answer – b) 1.5625
   Explanation :
   100*1 = 100
   100*0.5 = 50
   50*0.25 = 12.5
   12.5*0.125 = 1.5625
   
   
   
6. 10 16.5 43.75 156.625 ?
   a) 609.3125
   b) 809.3125
   c) 699.3125
   d) 709.3125
   e) None of these
   
   Answer & Explanation

   Answer – d) 709.3125
   Explanation :
   10*1.5 + 1.5 = 16.5
   16.5*2.5 + 2.5 = 43.75
   43.75*3.5 + 3.5 = 156.625
   156.625*4.5 + 4.5 = 709.3125
   
   
   
7. 17 19 28 92 ?
   a) 707
   b) 717
   c) 727
   d) 737
   e) None of these
   
   Answer & Explanation

   Answer – b) 717
   Explanation :
   17 + (2^1) = 19
   19 + (3^2) = 28
   28 + (4^3) = 92
   92 + (5^4) = 717
   
   
   
8. 625 624 597 472 129 ?
   a) – 200
   b) – 300
   c) – 400
   d) -600
   e) None of these
   
   Answer & Explanation

   Answer – d) -600
   Explanation :
   625 – (1^3) = 624
   624 – (3^3) = 597
   597 – (5^3) = 472
   472 – (7^3) = 129
   129 – (9^3) = – 600
   
   
   
9. 25 29 38 55 86 ?
   a) 138
   b) 141
   c) 143
   d) 145
   e) None of these
   
   Answer & Explanation

   Answer – c) 143Explanation :
   25 + (3 + 1) = 29
   29 + (6 + 3) = 38
   38 + (12 + 5) = 55
   55 + (24 + 7) = 86
   86 + (48 + 9) = 143
   
   
   
10. 100 125 225 450 850 ?
    a) 1375
    b) 1275
    c) 1475
    d) 1575
    e) None of these
    
    Answer & Explanation

    Answer – c) 1475
    Explanation :
    100 + 5^2 = 125
    125 + 10^2 = 225
    225 + 15^2 = 450
    450 + 20^2 = 850
    850 + 25^2 = 1475
    
    
    

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