Aptitude Questions: Number Series Set 25

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Questions Penned by Yogit

1. 17 36 52 63 67 ?
   a) 71
   b) 72
   c) 62
   d) 63
   e) None of these
   
   Answer & Explanation

   Answer – c) 62
   Explanation :
   17 + (5*4 -1) = 36
   36 + (5*4 – 4) = 52
   52 + (5*4 – 9) = 63
   63 + (5*4 – 16) = 67
   67 + (5*4 – 25) = 62
   
   
   
2. 10 28 64 115 175 ?
   a) 252
   b) 272
   c) 232
   d) 300
   e) None of these
   
   Answer & Explanation

   Answer – c) 232
   Explanation :
   10 + (21 – 3) = 28
   28 + (42 – 6) = 64
   64 + (63 – 12) = 115
   115 + (84 – 24) = 175
   175 + (105 – 48) = 232
   
   
   
3. 100 104 95 111 86 ?
   a) 112
   b) 122
   c) 132
   d) 142
   e) None of these
   
   Answer & Explanation

   Answer – b) 122
   Explanation :
   100 + 2^2 = 104
   104 – 3^2 = 95
   95 + 4^2 = 111
   111 – 5^2 =  86
   86 + 6^2 = 122
   
   
   
4. 50 53 59 73 105 ?
   a) 165
   b) 175
   c) 185
   d) 195
   e) None of these
   
   Answer & Explanation

   Answer – b) 175Explanation :
   50 + (5 -2) = 53
   53 + (10 – 4) = 59
   59 + (20 – 6) = 73
   73 + (40 – 8) = 105
   105 + (80 -10) = 175
   
   
   
5. 17 32 93 368 ?
   a) 1735
   b) 1835
   c) 1935
   d) 1995
   e) None of these
   
   Answer & Explanation

   Answer – b) 1835
   Explanation :
   17*2 – 2 = 32
   32*3 – 3 = 93
   93*4 – 4 = 368
   368*5 – 5 = 1835
   
   
   
6. 64 72 79 93 103 ?
   a) 104
   b) 105
   c) 107
   d) 110
   e) None of these
   
   Answer & Explanation

   Answer – b) 105
   Explanation :
   64 + (6+4 – 2) = 72
   72 + (7 +2 – 2) = 79
   79 + (7 + 9 – 2 ) = 93
   93 + (9 + 3 -2) = 103
   103 + (1 +0 +3 -2) = 105
   
   
   
7. 20 31 31 53 57 90 ?
   a) 95
   b) 96
   c) 98
   d) 92
   e) 100
   
   Answer & Explanation

   Answer – c) 98
   Explanation :
   20 + 11 = 31
   31 + 0 = 31
   31 + 22 = 53
   53 + 4 = 57
   57 + 33 = 90
   90 + 8 = 98
   
   
   
8. 5 20 53 112 205 ?
   a) 320
   b) 330
   c) 340
   d) 350
   e) None of these
   
   Answer & Explanation

   Answer – c) 340
   Explanation :
   5 + (4^2 – 1) = 20
   20 + (6^2 -3) = 53
   53 + (8^2 -5) = 112
   112 + (10^2 – 7) = 205
   205 +(12^2 – 9) = 340
   
   
   
9. 20 20 10 30 7.5 ?
   a) 32.5
   b) 37.5
   c) 41.25
   d) 43.25
   e) None of these
   
   Answer & Explanation

   Answer –b) 37.5
   Explanation :
   20*1 = 20
   20 ÷ 2 = 10
   10 * 3 = 30
   30 ÷4 = 7.5
   7.5 * 5 = 37.5
   
   
   
10. 64 66 72 88 128 ?
    a) 256
    b) 246
    c) 224
    d) 226
    e) None of these
    
    Answer & Explanation

    Answer – c) 224
    Explanation :
    64 + (1*2) = 66
    66 + (2*3) = 72
    72 + (4*4) = 88
    88 + (8*5) = 128
    128 + (16*6) = 224
    
    
    

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