# QUESTIONS ON REASONING (PART-6)

#### QUESTIONS ON REASONING (PART-6)

Most of these questions are taken from the previous examinations conducted by the Staff Selection Commission (SSC) of the General Intelligence and Reasoning section of the following exams as well as other similar exams. They are all solved and supported by detailed explanation.

1. Combined Graduate Level (CGL) Exam Tier-I

2. Combined Higher Secondary (10+2) Exam (CHSL) Tier-I

3. SI in Delhi Police and CPO Exam Tier-I

4. Stenographers Exam

5. Grade-II DASS Exam conducted by Delhi Staff Subordinate Services (DSSSB)

#### QUERY 101

**Find wrong number**

** 9, 19, 40, 83, 170, 340**

40

83

170

340

**Krishna Singh Thakur**

9*2 + 1 = 19

19*2 + 2 = 40

40*2 + 3 = 83

83*2 + 4 = 170

170*2 + 5 = 345

So the wrong number is 340 (option ‘4’)

QUERY 102

**Find wrong number in 0, 7, 28, 63, 124, 215**

7

215

63

28

**MAHA GUPTA**

Careful examination will say that every number is subtraction of 1 from cube of a natural number starting from 1; see how

0 = 1^3 – 1

7 = 2^3 – 1

So the next number must be 26 in place of 28 (option ‘4’)

26 = 3^3 – 1

63 = 4^3 – 1

124 = 5^3 – 1

215 = 6^3 – 1

QUERY 103

**Find wrong number**

** 5, 13, 29, 61, 120, 253**

61

253

29

120

**MAHA GUPTA**

Every number in the series is addition of 3 to double of its previous; see how

5*2 + 3 = 13

13*2 + 3 = 29

29*2 + 3 = 61

so the next number = 61*2 + 3 = 125; not 120 (option ‘4’)

125*2 + 3 = 253

QUERY 104

**13 : 19 : : 21 : ?**

141

14

81

41

**MAHA GUPTA**

LHS

First and second digits of the second numbers are squares of the first and second digits of the first number respectively; see how

1^2 = 1

3^2 = 9

Therefore the desired number of RHS

2^2 = 4

1^2 = 1

Means 41 (option ‘4’)

QUERY 105

**Find odd number**

** 27, 125, 216, 343**

216

343

125

27

**MAHA GUPTA**

27 (option ‘4’). The other numbers are cubes of consecutive numbers, whereas 27 not.

QUERY 106

**6 : 64 : : 11 : ?**

144

169

121

124

**MAHA GUPTA**

The second number on each side is the square of 2+the first number; see how

LHS

64 = (2+6)^2 = 8^2

So the required number = (2+11)^2 = 13^2 = 169 (option ‘2’)

QUERY 107

**If 55 + 66 = 33 , 22 + 99 = 33; then**

** 44 + 88 = ?**

38

40

33

36

**MAHA GUPTA**

Number on RHS is three times of the sum of one of the digits of each number on LHS; see how

(5+6)*3 = 33

(2+9)*3 = 33

Hence the required number = (4+8)*3 = 36 (option ‘4’)

QUERY 108

**If LONG is IG; what will be NAIL?**

**MAHA GUPTA**

L = 12; O = 15. Hence L+O = 27; 27/3 = 9 = I

N = 14; G = 7. Hence N+G = 21; 21/3 = 7 = G

So LONG = IG

Now N = 14; A = 1. Hence N+A = 15; 15/3 = 5 = E

I = 9; L = 12. Hence I+L = 21; 21/3 = 7 = G

So NAIL = EG (answer)

QUERY 109

**MAHA GUPTA**

Multiply the number of the outer triangle by its predecessor and 3 to get the number of the adjacent triangle; see how

2*1 + 3 = 5

3*2 + 3 = 9

4*3 + 3 = 15

5*4 + 3 = 23 (answer)

6*5 + 3 = 33

7*6 + 3 = 45

QUERY 110

**2 * 2 = 44**

** 4 * 4 = 168**

** 6 * 6 = 3612**

** 9 * 9 = ?**

**MAHA GUPTA**

First square the digit of LHS and then add to get RHS; see how

2^2 = 4; 2+2 = 4. RHS = 44

4^2 = 16; 4+4 = 8. RHS = 168

6^2 = 36, 6+6 = 12. RHS = 3612

Therefore the required number

9^2 = 81, 9+9 = 18. RHS = 8118

QUERY 111

**Find missing number**

** 8 9 10**

** 5 4 3**

** 28 ? 16**

** 12 25 14**

**Deepak Sharma**

Column-I: 8*5 – 12 = 28

Column-III: 10*3 – 14 = 16

Therefore, Column-II: 9*4 – 25 = 11 (answer)

QUERY 112

**MAHA GUPTA**

TYRE : BICYCLE. PETAL is a part of a flower that can be separated intact; likewise TYRE is a part of a bicycle that can be separated intact. SALT though can be a part of pepper, but can’t be separated from it.

QUERY 113

**1, 3, 8, 19, 42, ?**

65

71

89

93

**MAHA GUPTA**

Every number in the sequence is addition of a number in ascending order to its preceding number in sequence 1st, 2nd, 3rd, 4th; see how

1st number after 1 is 2; 1+2 = 3

2nd number after 3 is 5; 3 +5 = 8

3rd number after 8 is 11; 8+11 = 19

4th number after 19 is 23;19+23 = 42

Hence the required number

5th number after 42 is 47; 42+47 = 89 (option ‘3’)

QUERY 114

**Karan Mehta**

Can’t be energy and power because of irrelevant relationship; can’t be cells as its number can vary in a battery.

TERMINALS (option ‘C’) is right option as there are two two poles in a magnet.

QUERY 115

**IC : 6 :: DP : ??**

14

10

12

16

**MAHA GUPTA**

I = 9; C = 3

2nd term of LHS = (9+3)/2 = 6

D= 4; P = 16

Therefore the 2nd term of RHS = (4+16)/2 = 10 (option ‘2’)

QUERY 116

**MAHA GUPTA**

One should take these things in general; to think what happens generally at top level will lead us to wrong estimation for sure. All these three categories of people may be intermixed no doubt. So only and only answer is option ‘2’.

QUERY 117

**MAHA GUPTA**

Option ‘B’. One should take these things in general; to think what happens generally at top level will lead us to wrong estimation for sure. All these three categories of people may be intermixed no doubt. So only and only answer is option ‘B’.

QUERY 118

**MAHA GUPTA**

Option ‘1’. The middle circle represents ANTIBIOTICS. A capsule can contain an antibiotics inside or not, likewise an injection too can be of an antibiotics or not. But a capsule and injection are entirely two different things.

QUERY 119

**120, 440, 960, 1680, ?**

2600

3240

3040

2400

**MAHA GUPTA**

The difference in two consecutive number is increasing by 200; see how

440 – 120 = 320

960 – 440 = 520

1680 – 960 = 720

So the required number = 1680 + 920 = 2600 (option ‘1’)

QUERY 120

**Find the odd word**

wave

current

tide

storm

**MAHA GUPTA**

TIDE (option ‘3’). TIDE is a regular rise and fall in the level of sea caused by the pull of the moon and sun, whereas cause of all the other things mentioned is different.