Aptitude Questions: Number Series Set 23

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Questions Penned by Yogit

1. 17 25 32 37 47 ?
   a) 55
   b) 58
   c) 65
   d) 71
   e) None of these
   
   Answer & Explanation

   Answer – b) 58
   Explanation :
   17 + (1+7) = 25
   25 + (2+5) = 32
   32 + (3+2) = 37
   37 + (3+ 7) = 47
   47 + (4 +7) = 58
   
   
   
2. 100 112 132 160 196 ?
   a) 210
   b) 220
   c) 230
   d) 240
   e) None of these
   
   Answer & Explanation

   Answer – d) 240
   Explanation :
   100 +(4^2 – 2^2) = 112
   112 + (6^2 – 4^2) = 132
   132 + (8^2 – 6^2) = 160
   160 + (10^2 – 8^2) = 196
   196 + (12^2 – 10^2) = 240
   
   
   
3. 57 82 182 407 807 ?
   a) 1428
   b) 1432
   c) 1436
   d) 1456
   e) None of these
   
   Answer & Explanation

   Answer – b) 1432
   Explanation :
   57 + 5^2 = 82
   82 + 10^2 = 182
   182 + 15^2 = 407
   407 + 20^2 = 807
   807 + 25^2 = 1432
   
   
   
4. 10 10 15 30 75 ?
   a) 175
   b) 125
   c) 225
   d) 250
   e) None of these
   
   Answer & Explanation

   Answer – c) 225
   Explanation :
   *1, *3/2, *2, *5/2, *3
   
   
   
5. 350 175 87.5 ? 21.875 10.9375
   a) 43.75
   b) 47.25
   c) 43.25
   d) 47.75
   e) None of these
   
   Answer & Explanation

   Answer – a) 43.75
   Explanation :
   multiply each term by 0.5
   
   
   
6. 65 132 262 526 1050 ?
   a) 2102
   b) 2202
   c) 2302
   d) 2402
   e) None of these
   
   Answer & Explanation

   Answer – a) 2102
   Explanation :
    65*2 + 2 =132
   132*2 – 2 = 262
   262*2 + 2 = 526
   526*2 – 2 = 1050
   1050*2 + 2 = 2102
   
   
   
7. 50 95 215 305 1235 ?
   a) 655
   b) -655
   c) 455
   d) -455
   e) None of these
   
   Answer & Explanation

   Answer – b) -655
   Explanation :
   50*2 – 5 = 95
   95*2 + 25 = 215
   215*2 – 125 =305
   305*2 + 625 = 1235
   1235*2 – 3125 = -655
   
   
   
8. 45 22.5 33.75 84.375 289.3125 ?
   a) 1228.90625
   b) 1386.90625
   c) 1268.90625
   d) 1328.90625
   e) None of these
   
   Answer & Explanation

   Answer – e) None of these
   Explanation :
   *0.5, *1.5, *2.5, *3.5, *4.5
   
   
   
9. 22.5 33.75 ? 75.9375 113.90625
   a) 50.625
   b) 50.675
   c) 55.625
   d) 55.675
   e) None of these
   
   Answer & Explanation

   Answer – a) 50.625
   Explanation :
   multiply each term by 3/2
   
   
   
10. 36 39 48 63 84 111 ?
    a) 141
    b) 142
    c) 143
    d) 144
    e) None of these
    
    Answer & Explanation

    Answer – d) 144
    Explanation :
    36 + 3*1 = 39
    39 + 3*3 = 48
    48 + 3*5 = 63
    63 + 3*7 = 84
    84 + 3*9 = 111
    111 + 3*11 = 144
    
    
    

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