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Question 131

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

Which two signs should be interchanged to make the below equation mathematically correct?

16 × 96 + 3 - 45 ÷ 9 = 299

  1. AOption (a)

    ×, ÷

  2. BOption (b)

    ×, -

  3. COption (c)

    ×, +

  4. DOption (d)

    ÷, -

View answer & explanation

Correct answer

Answer: (c)C.

×, +

Why this answer is correct

  1. ×, ÷

Given equation: 16 × 96 + 3 - 45 ÷ 9 = 299

After interchanging the signs, we get:

L.H.S = 16 ÷ 96 + 3 - 45 × 9

= 0.16 + 3 – 405

= 3.16 – 405

= -401.84 ≠ R.H.S

  1. ×, -

Given equation: 16 × 96 + 3 - 45 ÷ 9 = 299

After interchanging the signs, we get:

L.H.S = 16 - 96 + 3 × 45 ÷ 9

= 16 – 96 + 15

= 31 – 96

= -65 ≠ R.H.S

3) ×, +

Given equation: 16 × 96 + 3 - 45 ÷ 9 = 299

After interchanging the signs, we get:

L.H.S = 16 + 96 × 3 - 45 ÷ 9

= 16 + 288 – 5

= 304 – 5

= 299 = R.H.S

  1. ÷, -

Given equation: 16 × 96 + 3 - 45 ÷ 9 = 299

After interchanging the signs, we get:

L.H.S = 16 × 96 + 3 ÷ 45 - 9

= 1536 + 0.067 – 9

= 1536.067 – 9

= 1527.067 ≠ R.H.S

Hence, ‘×, +’ is the correct answer.

Question 132

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

Out of the given options, three are similar in a certain manner. However, one option is NOT like the other three. Select the option which is different from the rest.

  1. AOption (a)

  2. BOption (b)

  3. COption (c)

  4. DOption (d)

View answer & explanation

Correct answer

Answer: (c)C.

Why this answer is correct

All the options except 'option 3' are similar to each other.

The triangle in 'option 3' is facing towards west, while in other options it is facing towards east.

Hence, 'option 3' is the odd one out.

Question 133

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

Find the missing number in the following series.

33, ___, 77, 99, 121

  1. AOption (a)

    55

  2. BOption (b)

    22

  3. COption (c)

    66

  4. DOption (d)

    44

View answer & explanation

Correct answer

Answer: (a)A.

55

Why this answer is correct

The logic is:

11 × 3 = 33

11 × 5 = 55

11 × 7 = 77

11 × 9 = 99

11 × 11 = 121

Hence, ‘55’ is the correct answer.

Question 134

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

Out of the given options, three are similar in a certain manner. However, one option is NOT like the other three. Select the option which is different from the rest.

  1. AOption (a)

    The Moon

  2. BOption (b)

    soccer ball

  3. COption (c)

    world globe

  4. DOption (d)

    starfish

View answer & explanation

Correct answer

Answer: (d)D.

starfish

Why this answer is correct

All options except 'starfish' are circular in shape, while 'starfish' is in the shape of a star.

Hence, ‘starfish’ is the odd one out.

Question 135

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

If in a certain code language- ZINNIA = 73 , DAISY = 58, then what is the code for JASMINE?

  1. AOption (a)

    75

  2. BOption (b)

    69

  3. COption (c)

    57

  4. DOption (d)

    71

View answer & explanation

Correct answer

Answer: (d)D.

71

Why this answer is correct

The pattern followed here is:

According to the alphabetical positions of the letters,

ZINNIA = 73 → Z (26) + I (9) + N (14) + N (14) + I (9) + A (1) = 26 + 9 + 14 + 14 + 9 + 1 = 73

DAISY = 58 → D (4) + A (1) + I (9) + S (19) + Y (25) = 4 + 1 + 9 + 19 + 25 = 58

Similarly,

JASMINE → J (10) + A (1) + S (19) + M (13) + I (9) + N (14) + E (5) = 10 + 1 + 19 + 13 + 9 + 14 + 5 = 71

Hence, ‘71’ is the correct answer.

Question 136

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

The age of sumitha 15 years later will be 4 times her age 3 years back. What is the present age of sumitha ?

  1. AOption (a)

    6

  2. BOption (b)

    3

  3. COption (c)

    4

  4. DOption (d)

    9

View answer & explanation

Correct answer

Answer: (d)D.

9

Why this answer is correct

Let the present age of Sumitha be 'a' years.

According to question:

a + 15 = 4 (a - 3)

⇒ a + 15 = 4a - 12

⇒ 15 + 12 = 4a - a

⇒ 27 = 3a

⇒ a = 27/3

⇒ a = 9

So, the present age of Sumitha is 9 years.

Hence, ‘9’ is the correct answer.

Question 137

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

Which two signs should be interchanged to make the equation given below mathematically correct?

0.01 - 0.02 × 0.04 + 0.06 ÷ 0.03 = 0.07

  1. AOption (a)

    ×, ÷

  2. BOption (b)

    ÷, -

  3. COption (c)

    ×, +

  4. DOption (d)

    ×, -

View answer & explanation

Correct answer

Answer: (c)C.

×, +

Why this answer is correct

  1. ×, ÷

Given equation: 0.01 - 0.02 × 0.04 + 0.06 ÷ 0.03 = 0.07

After interchanging the signs, we get:

L.H.S = 0.01 - 0.02 ÷ 0.04 + 0.06 × 0.03

= 0.01 – 0.5 + 0.0018

= 0.0118 – 0.5

= -0.4882 ≠ R.H.S

  1. ÷, -

Given equation: 0.01 - 0.02 × 0.04 + 0.06 ÷ 0.03 = 0.07

After interchanging the signs, we get:

L.H.S = 0.01 ÷ 0.02 × 0.04 + 0.06 - 0.03

= 0.5 × 0.04 + 0.06 - 0.03

= 0.02 + 0.06 – 0.03

= 0.08 – 0.03

= 0.05 ≠ R.H.S

3) ×, +

Given equation: 0.01 - 0.02 × 0.04 + 0.06 ÷ 0.03 = 0.07

After interchanging the signs, we get:

L.H.S = 0.01 - 0.02 + 0.04 × 0.06 ÷ 0.03

= 0.01 – 0.02 + 0.08

= 0.09 – 0.02

= 0.07 = R.H.S

  1. ×, -

Given equation: 0.01 - 0.02 × 0.04 + 0.06 ÷ 0.03 = 0.07

After interchanging the signs, we get:

L.H.S = 0.01 × 0.02 - 0.04 + 0.06 ÷ 0.03

= 0.0002 – 0.04 + 2

= 2.0002 – 0.04

= 1.9602 ≠ R.H.S 

Hence, ‘×, +’ is the correct answer.

Question 138

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

Select the option that is related to the third term on the same basis as the second term is related to the first term.

Badminton : shuttlecock :: Snooker : ?

  1. AOption (a)

    Billiard ball

  2. BOption (b)

    volleyball

  3. COption (c)

    baseball

  4. DOption (d)

    golf ball

View answer & explanation

Correct answer

Answer: (a)A.

Billiard ball

Why this answer is correct

The logic is:

Badminton : shuttlecock → Shuttlecock is a lightweight conical object with a rounded often rubber-covered nose that is used in badminton.

Similarly,

Snooker : ? → A billiard ball is a small, hard ball used in cue sports, such as carom billiards, pool, and snooker.

Hence, ‘Billiard ball’ is the correct answer.

Question 139

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

Four years ago, Sneha's age was one-third of the age, she will be in 6 years. How old is she now?

  1. AOption (a)

    9 years

  2. BOption (b)

    6 years

  3. COption (c)

    8 years

  4. DOption (d)

    13 years

View answer & explanation

Correct answer

Answer: (a)A.

9 years

Why this answer is correct

Let the present age of Sneha be 'a' years.

According to question:

a - 4 = 1/3 (a + 6)

⇒ 3 (a - 4) = a + 6

⇒ 3a - 12 = a + 6

⇒ 3a - a = 6 + 12

⇒ 2a = 18

⇒ a = 18/2

⇒ a = 9

So, Sneha is 9 years old now.

Hence, ‘9 years’ is the correct answer.

Question 140

Delhi Forest Guard 2021• General Intelligence and Reasoning Ability

Complete the following number series:

121, 110, 120, 111, ____

  1. AOption (a)

    130

  2. BOption (b)

    121

  3. COption (c)

    114

  4. DOption (d)

    119

View answer & explanation

Correct answer

Answer: (d)D.

119

Why this answer is correct

The logic is:

Hence, ‘119’ is the correct answer.