Aptitude Questions: Number Series Set 18

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1. 540, 272.5, ? , 141.25, 78.125, 49.06
   A.160.25
   B.141.25
   C.90.50
   D.210.75
   E.None of these
   
   Answer & Explanation

   Answer – B.141.25
   Explanation :
   (540+5)/2 = 272.5
   (272.5+10)/2 = 141.25
   (141.25+15)/2 = 78.125
   (78.125+20)/2 = 49.0625
   
   
   
2. 2340, 1172, 590, 301, ?
   A.201.50
   B.160.6
   C.158.5
   D.124.05
   E.None of these
   
   Answer & Explanation

   Answer – C.158.5
   Explanation :
   2340÷2 = 1170+2 = 1172
   1172÷2 = 586+4 = 590
   590÷2 =295+6 =301
   301÷2 = 150.5+8 = 158.5
   
   
   
3. 5, 136, ? , 8768, 88680
   A.1032
   B.1356
   C.1562
   D.2450
   E.None of these
   
   Answer & Explanation

   Answer – A.1032
   Explanation :
   5*2+2^3 = 18
   18*4+4^3 = 136
   136*6+6^3 = 1032
   1032*8+8^3 = 8768
   8768*10+10^3 = 88680
   
   
   
4. 19, 21, 45, 139, ?, 2811
   A.1780
   B.786
   C.1290
   D.561
   E.None of these
   
   Answer & Explanation

   Answer – D.561
   Explanation :
   19*1+2 = 21
   21*2+3 = 45
   45*3+4 = 139
   139*4+5 = 561
   561*5+6 = 2811
   
   
   
5. 36, 19, 18, 28, 55, 138.5, ?
   A.234.6
   B.414.5
   C.560.8
   D.643.5
   E.None of these
   
   Answer & Explanation

   Answer – B.414.5
   Explanation :
   36*0.5+1 = 19
   19*1 – 1 = 18
   18*1.5+1 = 28
   28*2-1 = 55
   55*2.5+1 = 138.5
   138.5*3-1 = 414.5
   
   
   
6. 78, 126, 468, 198, ? , 670
   A.1546
   B.2076
   C.1872
   D.1076
   E.None of these
   
   Answer & Explanation

   Answer – C.1872
   Explanation :
   78*2 = 156            126+8 = 134
   156*3 = 468          134+64 = 198
   468*4 = 1872        158+512 = 670
   
   
   
7. 11, 15, 24, 40, 165, 201, ?
   A.320
   B.670
   C.987
   D.544
   E.None of these
   
   Answer & Explanation

   Answer – D.544
   Explanation :
   11+2^2 = 15
   15+3^3 = 24
   24+4^2 = 40
   40+5^3 = 165
   165+6^2 = 201
   201+7^3 = 544
   
   
   
8. 167, 83.5, 83.5, 125.25, 250.5,  ?, 2630.25
   A.1240.05
   B.980.50
   C.245.80
   D.751.50
   E.None of these
   
   Answer & Explanation

   Answer – D.751.50
   Explanation :
   167*1/2 = 83.5
   83.5*2/2 = 83.5
   83.5*3/2 = 125.25
   125.25*4/2 = 250.5
   250.5*6/2 = 751.5
   751.5*7/2 = 2630.25
   
   
   
9. 4320, 4327, 2173.5, 6533.5, ?
   A.1649.48
   B.2198.82
   C.1960.5
   D.3650.5
   E.None of these
   
   Answer & Explanation

   Answer – A.1649.48
   Explanation :
   4320*1+7 =4327
   4327÷2+10 = 2173.5
   2173.5*3+13 = 6533.5
   6533.5÷4+16 = 1649.48
   
   
   
10. 90, 30, 24, ? , 48.72, 88.08
    A.56.9
    B.45.8
    C.30.6
    D.64.5
    E.None of these
    
    Answer & Explanation

    Answer – C.30.6
    Explanation :
    90*0.3 + 3 = 30
    30*0.6+6 = 24
    24*0.9+9 = 30.6
    30.6*1.2+12 = 48.72
    48.72*1.5+15 = 88.08
    
    
    

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