Aptitude Questions – Number Series Set 64

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1. 5, 12, ?, 41, 87, 214
   1.19
   2.35
   3.22
   4.26
   5.None of these
   
   Answer & Explanation

   Answer – 3.22
   Explanation :
   5+7 = 12
   12+(7+3=10) =22
   22+(10+9=19) = 41
   41+(19+27=46) = 87
   87+(46+81=127) = 214
   
   
   
2. 14, ?, 13, 17.5, 21.75
   1.10
   2.12
   3.12.5
   4.13.25
   5.None of these
   
   Answer & Explanation

   Answer – 2.12
   Explanation :
   14/2 + 5 = 12
   12/2 +7 = 13
   13/2 + 11= 17.5
   17.5/2+13 = 21.75
   
   
   
3. 15, 5, 4.5, 5.8.7.9, ?
   1.9.6
   2.11.42
   3.12.23
   4.10.74
   5.None of these
   
   Answer & Explanation

   Answer – 4.10.74
   Explanation :
   15*0.2 +2 = 5
   5*0.3+3 = 4.5
   4.5*0.4+4 = 5.8
   5.8*0.5+5 =7.9
   7.9*0.6+6 = 10.74
   
   
   
4. 107, 106, 52, 16.3 , ?
   1.3.075
   2.2.625
   3.1.916
   4.0.416
   5.None of these
   
   Answer & Explanation

   Answer – 1.3.075
   Explanation :
   107-1/1 = 106
   106-2/2 = 52
   52-3/3 = 16.3
   16.3-4/4 = 3.075
   
   
   
5. 29, ?, 79, 131, 201
   1.61
   2.76
   3.37
   4.45
   5.None of these
   
   Answer & Explanation

   Answer – 4.45 Explanation :
   29+(18*1-2) = 29+16 = 45
   45+(18*2-2) = 45+34 = 79
   79+(18*3-2) = 79+52 = 131
   131+(18*4-2) = 131+70 = 201
   
   
   
6. ?, 6, 10.5, 23, 60
   1.7
   2.5
   3.4
   4.6
   5.None of these
   
   Answer & Explanation

   Answer – 2.5
   Explanation :
   9*0.5+0.5 = 5
   5*1+1 = 6
   6*1.5+1.5 = 10.5
   10.5*2+2 = 23
   23*2.5+2.5 = 60
   
   
   
7. 211, 90, 171, 122, 147, 138, ?
   1.152
   2.176
   3.139
   4.180
   5.None of these
   
   Answer & Explanation

   Answer – 3.139
   Explanation :
   211-11^2 = 90
   90+9^2 = 171
   171-7^2 = 122
   122+5^2 = 147
   147-3^2 = 138
   138+1^2= 139
   
   
   
8. 1256, 318, ?, 163, 328, 86
   1.338
   2.836
   3.368
   4.638
   5.None of these
   
   Answer & Explanation

   Answer – 4.638
   Explanation :
   1256/4 =314+4 = 318
   318*2 = 636+2 = 638
   638/4 = 159+4 = 163
   163*2 =326+2 = 328
   328/4 = 82+4 = 86
   
   
   
9. 37, 54, 88, ?, 207
   1.139
   2.213
   3.193
   4.391
   5.None of these
   
   Answer & Explanation

   Answer – 1.139
   Explanation :
   37+17 = 54
   54+2*17 = 88
   88+3*17 =139
   139+4*17 = 207
   
   
   
10. 13, 29, 48, 70, 95, ?
    1.132
    2.121
    3.113
    4.123
    5.None of these
    
    Answer & Explanation

    Answer – 4.123
    Explanation :
    13+(9+7) = 29
    29+(9+10) = 48
    48+(9+13) =70
    70+(9+16) = 95
    95+(9+19) = 123