# Aptitude Questions: Number Series Set 26

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 !!!

Questions Penned by Yogit

1. 40 42 21 23 11.5 ?
a) 11.5
b) 13.5
c) 17.5
d) 52
e) None of these
Explanation :
40 + 2 = 42
42 ÷ 2 = 21
21 + 2 = 23
23 ÷ 2 = 11.5
11.5 + 2 = 13.5

2. 17 89 154 210 255 ?
a) 237
b) 247
c) 267
d) 287
e) None of these
Explanation :
17 + (81 – 9) = 89
89 + (81 – 16) = 154
154 + (81 – 25) = 210
210 + (81 – 36) = 255
255 + (81 – 49) = 287

3. 10 25 42 63 92 ?
a) 127
b) 137
c) 147
d) 157
e) None of these
Explanation :
10 + 15 = 25
25 + 17 = 42
42 + 21 = 63
63 + 29 = 92
92 + 45 = 137

4. 12 34 98 286 ?
a) 832
b) 842
c) 852
d) 864
e) None of these
Explanation :
12*3 – 2 = 34
34*3 – 4 = 98
98*3 – 8 = 286
286*3 – 16 = 842

5. 100 100 50 12.5 ?
a) 2.5625
b) 1.5625
c) 3.5625
d) 4.5625
e) None of these
Explanation :
100*1 = 100
100*0.5 = 50
50*0.25 = 12.5
12.5*0.125 = 1.5625

6. 10 16.5 43.75 156.625 ?
a) 609.3125
b) 809.3125
c) 699.3125
d) 709.3125
e) None of these
Explanation :
10*1.5 + 1.5 = 16.5
16.5*2.5 + 2.5 = 43.75
43.75*3.5 + 3.5 = 156.625
156.625*4.5 + 4.5 = 709.3125

7. 17 19 28 92 ?
a) 707
b) 717
c) 727
d) 737
e) None of these
Explanation :
17 + (2^1) = 19
19 + (3^2) = 28
28 + (4^3) = 92
92 + (5^4) = 717

8. 625 624 597 472 129 ?
a) – 200
b) – 300
c) – 400
d) -600
e) None of these
Explanation :
625 – (1^3) = 624
624 – (3^3) = 597
597 – (5^3) = 472
472 – (7^3) = 129
129 – (9^3) = – 600

9. 25 29 38 55 86 ?
a) 138
b) 141
c) 143
d) 145
e) None of these
25 + (3 + 1) = 29
29 + (6 + 3) = 38
38 + (12 + 5) = 55
55 + (24 + 7) = 86
86 + (48 + 9) = 143

10. 100 125 225 450 850 ?
a) 1375
b) 1275
c) 1475
d) 1575
e) None of these