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Question 411

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in place of the question mark (?) in the following question?

64 ÷ √? + 12 = 20

  1. AOption (a)

    81

  2. BOption (b)

    64

  3. COption (c)

    49

  4. DOption (d)

    25

  5. EOption (e)

    121

View answer & explanation

Correct answer

Answer: (b)B.

64

Why this answer is correct

Given,

64 ÷ √? + 12 = 20

⇒ 64 ÷ √? = 8

⇒ 64 ÷ 8 = √?

⇒  8 = √?

∴  ? = 82 = 64.

Question 412

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in place of question mark (?) in the following equation?

27 – [162 – (273 + 281) ÷ 2] = ?

  1. AOption (a)

    52

  2. BOption (b)

    58

  3. COption (c)

    32

  4. DOption (d)

    48

  5. EOption (e)

    38

View answer & explanation

Correct answer

Answer: (d)D.

48

Why this answer is correct

Follow BODMAS rule to solve this question, as per the order given below, 

Step-1: Parts of an equation enclosed in 'Brackets' must be solved first, and in the bracket, 

Step-2: Any mathematical 'Of' or 'Exponent' must be solved next, 

Step-3: Next, the parts of the equation that contain 'Division' and 'Multiplication' are calculated, 

Step-4: Last but not least, the parts of the equation that contain 'Addition' and 'Subtraction' should be calculated 

27 – [162 – (273 + 281) ÷ 2]

= 27 – [256 – 554/2]

= 27 – 256 + 277

= 48

Question 413

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What value should come in the place of question mark (?) in the following question?

555 - 210 + √? = 192 + 27 × 7 ÷ 21

  1. AOption (a)

    144

  2. BOption (b)

    169

  3. COption (c)

    625

  4. DOption (d)

    225

  5. EOption (e)

    121

View answer & explanation

Correct answer

Answer: (c)C.

625

Why this answer is correct

555 - 210 + √? = 192 + 27 × 7 ÷ 21

⇒ 345 + √? = 361 + 9

⇒ 345 + √? = 370

⇒ √? = 25

⇒ ? = 625

Question 414

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in place of question mark (?) in the following equation?

50% of 7800 ÷ 26 ÷ 25 = ?

  1. AOption (a)

    4

  2. BOption (b)

    12

  3. COption (c)

    8

  4. DOption (d)

    6

  5. EOption (e)

    2

View answer & explanation

Correct answer

Answer: (d)D.

6

Why this answer is correct

GIVEN :

50% of 7800 ÷ 26 ÷ 25 = ?

CONCEPT :

CALCULATION :

50% of 7800 ÷ 26 ÷ 25 = ?

⇒ 3900 ÷ 26 ÷ 25 = ?

⇒ ? = 150 ÷ 25

∴ ? = 6

Question 415

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in place of question mark (?) in the following equation?

(4 × 3)4 ÷ (9 × 16)3 × (64 × 27)5 = (12)?

  1. AOption (a)

    11

  2. BOption (b)

    12

  3. COption (c)

    13

  4. DOption (d)

    14

  5. EOption (e)

    15

View answer & explanation

Correct answer

Answer: (c)C.

13

Why this answer is correct

(4 × 3)4 ÷ (9 × 16)3 × (64 × 27)5 = (12)?

⇒ 124 ÷ 126 × 1215 = 12?

⇒ 124 - 6 + 15 = 12?

Hence, ? = 4 - 6 + 15

∴ ? = 13

Question 416

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in place of question mark (?) in the following equation?

[28 - {8 + 12 ÷ (16 - 12)}] = ?

  1. AOption (a)

    13

  2. BOption (b)

    9

  3. COption (c)

    21

  4. DOption (d)

    17

  5. EOption (e)

    15

View answer & explanation

Correct answer

Answer: (d)D.

17

Why this answer is correct

Follow BODMAS rule to solve this question, as per the order given below, 

Step-1: Parts of an equation enclosed in 'Brackets' must be solved first, and in the bracket, 

Step-2: Any mathematical 'Of' or 'Exponent' must be solved next, 

Step-3: Next, the parts of the equation that contain 'Division' and 'Multiplication' are calculated, 

Step-4: Last but not least, the parts of the equation that contain 'Addition' and 'Subtraction' should be calculated 

[28 - {8 + 12 ÷ (16 - 12)}] = ?

⇒ [28 - {8 + 12 ÷ 4}] = ?

⇒ [28 - {8 + 3}] = ?

⇒ [28 - 11] = ?

∴ ? = 17

Question 417

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in place of the question mark ‘?’ in the following question?

1280% of 75 ÷ 30 + ? = 80

  1. AOption (a)

    42

  2. BOption (b)

    44

  3. COption (c)

    46

  4. DOption (d)

    48

  5. EOption (e)

    50

View answer & explanation

Correct answer

Answer: (d)D.

48

Why this answer is correct

1280% of 75 ÷ 30 + ? = 80

⇒ 960 ÷ 30 + ? = 80

⇒ 32 + ? = 80

⇒ ? = 80 - 32 = 48

Question 418

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in place of question mark (?) in the following equation?

(√361 × 36) ÷ 12 + √441 = ?

  1. AOption (a)

    78

  2. BOption (b)

    72

  3. COption (c)

    63

  4. DOption (d)

    69

  5. EOption (e)

    57

View answer & explanation

Correct answer

Answer: (a)A.

78

Why this answer is correct

Follow BODMAS rule to solve this question, as per the order given below, 

Step-1: Parts of an equation enclosed in 'Brackets' must be solved first, and in the bracket, 

Step-2: Any mathematical 'Of' or 'Exponent' must be solved next, 

Step-3: Next, the parts of the equation that contain 'Division' and 'Multiplication' are calculated, 

Step-4: Last but not least, the parts of the equation that contain 'Addition' and 'Subtraction' should be calculated 

(√361 × 36) ÷ 12 + √441 = ?

⇒ (19 × 36) ÷ 12 + 21 = ?

⇒ 684 ÷ 12 + 21 = ?

⇒ 57 + 21 = ?

∴ ? = 78

Question 419

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in place of question mark (?) in the following equation?

700 ÷ 14 × 8 – ? = 156 + 244

  1. AOption (a)

    10

  2. BOption (b)

    20

  3. COption (c)

    0

  4. DOption (d)

    -10

  5. EOption (e)

    -20

View answer & explanation

Correct answer

Answer: (c)C.

0

Why this answer is correct

Follow BODMAS rule to solve this question, as per the order given below, 

Step-1: Parts of an equation enclosed in 'Brackets' must be solved first, and in the bracket, 

Step-2: Any mathematical 'Of' or 'Exponent' must be solved next, 

Step-3: Next, the parts of the equation that contain 'Division' and 'Multiplication' are calculated, 

Step-4: Last but not least, the parts of the equation that contain 'Addition' and 'Subtraction' should be calculated

700 ÷ 14 × 8 – ? = 156 + 244

⇒ 50 × 8 – ? = 400

⇒ 400 – ? = 400

⇒ ? = 400 – 400 = 0

Question 420

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

What will come in the place of the question mark ‘?’ in the following question?

? + 303 = 519 – 90 + 182

  1. AOption (a)

    900

  2. BOption (b)

    500

  3. COption (c)

    400

  4. DOption (d)

    450

  5. EOption (e)

    350

View answer & explanation

Correct answer

Answer: (d)D.

450

Why this answer is correct

Follow BODMAS rule to solve this question, as per the order given below.

Step - 1: Parts of an equation enclosed in 'Brackets' must be solved first, and following BODMAS rule in the bracket -

Step - 2: Any mathematical 'Of' or 'Exponent' must be solved next.

Step - 3: Next, the parts of the equation that contain 'Division' and 'Multiplication' are calculated.

Step - 4: Last but not the least, the parts of the equation that contain 'Addition' and 'Subtraction' should be calculated.

Given expression is

? + 303 = 519 – 90 + 182

⇒ ? + 303 = 519 – 90 + 324

⇒ ? + 303 = 843 – 90 

⇒ ?  = 753 – 303

⇒  ? = 450

∴ ? = 450

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