# Aptitude Questions: Number Series Set 18

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. 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
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
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
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
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
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
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
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
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
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
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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