Quantitative Aptitude Questions & Answers

(1). 46080, 3840, 384, 48, 8, 2, ?
A. 1
B. 1/64
C. 1/8
D. 2
E. None of these

Answer: (A)

46080 /12 = 3840
3840 /10 = 384
384 /8 = 48
48 /6 = 8
8/4 = 2
2 /2 = 1

(2). 279936, 46656, 7776, 1296, 216, ?
A. 60
B. 46
C. 36
D. 66
E. None of these

Answer: (C)

Go on dividing by 6 to the next number

(3). 12, 38, 116, 350, 1052, ?
A. 1800
B. 2200
C. 2800
D. 3158
E. None of these

Answer: (D)

12
12 × 3 + 2 = 38
38 × 3 + 2 = 116
116 × 3 + 2 = 350
350 × 3 + 2 = 1052
1052 × 3 + 2 = 3158

(4). 2, 7, 10, 22, 18, 37, 26,?
A. 42
B. 52
C. 46
D. 62
E.None of these

Answer: (B)

There are two series here
2, 10, 18, 26, ... (Increase by 8)
7, 22, 37, ... (Increase by 15)
Hence, next term is 37+15 = 52

(5). 5,28,57,88,125
A.156
B.147
C.166
D.186
E. None of these

Answer: (C)

28=23+5
57=29+28
88=31+57
125=37+88
166=41+125

6. 15, 16, 34, 105, 424, 2124, 12756
A.16
B.34
C.105
D.424
E.2124

Answer: (E)

2nd term = (1st term) * 1 + 1 = 15 *1 + 1 = 16.
3rd term = (2nd term) * 2 + 2 = 16 * 2 + 2 = 34
4th term = (3th term) *3 + 3 = 34 * 3 + 3 = 105
5th term = (4th term) * 4 + 4 = 105 * 4 + 4 = 424
6th term = (5th term) * 5 + 5 = 424 * 5 + 5 = 2125
6th term should 2125 instead of 2124.

7. 15 46 63 71 75 77 78
A.15
B.46
C.63
D.71
E.75

Answer: (B)

In this question, if you start from the beginning, firstly the difference is 31,
then the difference is 17, then the difference is 8. So there is no logic. If you start backwards,you can see that firstly,
1 is added, then 2 is added, then 4 is added, then 8,16 and 32 should have been added. So you have got the right clue.
So 15 + 32 the first number should be 47 and afterwards, the series becomes + 16, + 8, + 4and so on.

8. 2,3,12,37,86,166,288
A.37
B.86
C.166
D.288
E.12

Answer: (C)

3-2=1
12-3=9
37-12=25
86-37=49
166-86=80(this must be 81=167-86=81)
so wrong number in the sequence is 166
difference between two sucessive numbers sequence would be
1,9,25,49,81,121(square of 1,3,5,7,9,11)

9. 13, 18, 25, 30, 37, 40
A. 25
B. 30
C. 37
D. 40
E.None of these

Answer: (D)

The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.

10. 3, 7, 15, 27, 63, 127, 255
A.7
B.15
C.27
D.63
E.127

Answer: (C)

Go on multiplying the number by 2 and adding 1 to it to get the next number.So, 27 is wrong.