# Quantitative Aptitude: Number Series Set 65

1. 20, 31, ?, 86, 130
48
42
53
36
None
Option C
Solution:
20+11*1=31
31+11*2=53
53+11*3=86
86+11*4=130.
2. 15, 13 , 16, 11, ?
18
22
19
24
None
Option A
Solution:
15-2=13
13+3=16
16-5=11
11+7=18.
3. 1/10, 1/5, 3/5, ?, 12
4/9
12/5
11/5
8/9
None
Option B
Solution:
1/10*2=1/5
1/5*3=3/5
3/5*4=12/5
12/5*5=12.
4. 4, ?, 369, 513, 634
200
230
256
310
None
Option A
Solution:
4+ 142=4+196=200
200+132=200+169=369
369+122=369+144=513
513+112=513+121=634.
5. 5, 17, 53, ?, 485,
190
136
142
161
None
Option D
Solution:
5*3+2=17
17*3+2=53
53*3+2=161
161*3+2=485.
6. 1, 2, 6, 21, ?
54
65
88
76
None
Option C
Solution:
(1+1)*1=2
(2+1)*2=6
(6+1)*3=21
(21+1)*4=88.
7. 3, 6, 4, ?, 5, 10
16
12
8
20
None
Option B
Solution:
3*2=6
4*3=12
5*2=10.
8. 50, 60, ?, 97.5, 131.625
66
70
75
84
None
Option C
Solution:
50*1.2=60
60*1.25=75
75*1.3=97.5
97.5*1.35=131.625.
9. 300, 65, 18, 8.6, ?
7.5
7.28
8.52
6.72
None
Option D
Solution:
300/5+5=65
65/5+5=18
18/5+5=8.6
8.6/5+5=6.72.
10. 11, 15, ?, 67, 131
25
32
36
31
None
Option D
Solution:
11+22=15
15+42=31
31+62=67
67+82=131.

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