Quantitative Aptitude

Directions (Q. 1-10): What should come in place of the question mark (?) in the following series?

1. 680 655 704 623 744 ?
a) 575
b) 675
c) 600
d) 913
e) None of these

1. a

680 - 5^2 = 655

655 + 7^2 = 704

704 - 9^2 = 623

623 + 11^2 = 744

744 - 13^2 = 575

2. 10 10 20 ? 110 300 930
a) 40
b) 35
c) 45
d) 50
e) 60

2. c

10 × 0.5 + 5 = 10

10 × 1 + 10 = 20

20 × 1.5 + 15 = 45

45 × 2 + 20 = 110

110 × 2.5 + 25 = 300

300 × 3 + 30 = 930

3. 1 ? 22 188 2052 28748
a) 2
b) 3
c) 6
d) 16
e) 10

3. c

1 × 2 + 4 = 6

6 × 5 - 8 = 22

22 × 8 + 12 = 188

188 × 11 - 16 = 2052

2052 × 14 + 20 = 28748

4. 50327 7169 1215 223 76 ?
a) 1
b) 2
c) 3
d) 4
e) 8

4. d

(50327 – 144) ÷ 7 = 7169

(7169 + 121) ÷ 6 = 1215

(1215 – 100) ÷ 5 = 223

(223 + 81) ÷ 4 = 76

(76 – 64) ÷ 3 = 4

5. 14 34 62 ? 142 194
a) 94
b) 98
c) 108
d) 112
e) None of these

5. b

2 + 3 × 4 = 14

4 + 5 × 6 = 34

6 + 7 × 8 = 62

8 + 9 × 10 = 98

10 + 11 × 12 = 142

12 + 13 × 14 = 194

6. 124 215 342 511 ? 999
a) 695
b) 625
c) 728
d) 806
e) 573

6. c

The series is

5^3 – 1 = 124

6^3 – 1 = 215

7^3 – 1 = 342

8^3 – 1 = 511

9^3 – 1 = 728

10^3 – 1 = 999

Reqd answer = 728.

7. 516 256 126 61 28.5 ?
a) 12.25
b) 16.75
c) 14.25
d) 20.20
e) 18.7

7. a;

 The series is

8. 7 21 50 109 ? 467
a) 198
b) 228
c) 372
d) 402
e) 275

8. b;

 The series is

 

9. 18 82 118 134 138 ?
a) 132
b) 198
c) 125
d) 138
e) 92

9. d;

 The series is

 

10. 5 22 103 406 ? 2422
a) 1516
b) 1298
c) 1136
d) 1602
e) 1213

10. e;

 The series is