# Quants Questions : Number Series Set 9

Hello Aspirants. Welcome to Online Quantitative Aptitude Section in AffairsCloud.com. Here we are creating question sample in Number Series, which is common for all the competitive exams. We have included Some questions that are repeatedly asked in bank exams !!!

1. 110, 90, 72, 56,  ?
A)45
B)42
C)35
D)30
B)42
Explanation :
11^2 – 11 = 110
10^2 – 10 = 90
9^2 – 9 = 72
8^2 – 8 = 56
7^2 – 7 =42

2. 210, 420,1050,3150, ?
A)11025
B)5690
C)7654
D)9876
A)11025
Explanation :
210*2 = 420
420*2.5 = 1050
1050*3 = 3150
3150*3.5 = 11025

3. 165, 164, 163, 159, 151, ?
A)156
B)145
C)142
D)150
C)142
Explanation :
165 – 1^2 = 164
164 – 1^3 = 163
163 – 2^2 = 159
159 – 2^3 = 151
151 – 3^2 = 142

4. 658, 1315, 2627, 5249, ?
A)11670
B)8480
C)7680
D)10491
D)10491
Explanation :
658*2-1 = 1315
1315*2 – 3 = 2627
2627*2 – 5 = 5249
5249*2 – 7 = 10491

5. 67, 68, 138, 417, 1672, ?
A)8365
B)8670
C)6578
D)5400
A)8365
Explanation :
67*1+1 = 68
68*2+2 =138
138*3+3 =417
417*4+4 = 1672
1672*5+5 = 8365

6. 1011, 980, 951, 924, 899, ?
A)874
B)876
C)808
D)796
B)876
Explanation :
1011 – 31 = 980
980 – 29 = 951
951 – 27 = 924
924 – 25 = 899
899 – 23 = 876

7. 123, 60.27, 21.70, 5.42, ?
A)0.087
B)2.7
C)0.87
D)1.67
C)0.87
Explanation :
123*0.7*0.7 = 60.27
60.27*0.6*0.6 = 21.70
21.70*0.5*0.5 = 5.42
5.42*0.4*0.4 = 0.87

8. 321, 53.5, 21.4, 16.05, ?
A)5.4
B)13.6
C)10.9
D)21.4
D)21.4
Explanation :
321*1/6 = 53.5
53.5*2/5 = 21.4
21.4*3/4 = 16.05
16.05*4/3 = 21.4

9. 11, 522,102.2,22, 456, ?
A)98.7
B)69.8
C)86.8
D)76.5
C)86.8
Explanation :
522 – 11 = 511/5 = 102.2
456 – 22 = 434/5 = 86.8

10. 5640, 2820, 1410, 705, ?
A)362.5
B)345.7
C)352.5
D)367
C)352.5
Explanation :
5640 – (5640/2) = 2820
2820 – (2820/2) = 1410
1410 – (1410/2) = 705
705 – (705/2) = 352.5

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