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Question 501

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

Sandeep lent Rs. 25000 to Arvind and if Arvind returned it to him after 3 years at simple interest rate of 12%, find the amount of interest.

  1. AOption (a)

    Rs. 10,000

  2. BOption (b)

    Rs. 9000

  3. COption (c)

    Rs. 8000

  4. DOption (d)

    Rs. 5000

  5. EOption (e)

    None of these

View answer & explanation

Correct answer

Answer: (b)B.

Rs. 9000

Why this answer is correct

Given:

Arvind borrow an amount = Rs. 25000 

Time period = 3 years

Rate of interest = 12%

Formula Used:

(P × R × T)/100 = S.I

Where P = Principle, R = Rate of interest, T = Time, S.I = Simple interest.

Calculation:

S.I = (P × R × T)/100

⇒ (25000 × 12 × 3)/100

⇒ 250 × 36

⇒ 9000

∴ The amount of interest is Rs. 9000.

Additional Information

 Borrowed money is considered as the Principle.

Question 502

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

Boat can do a round trip of 88 km (44 km to and fro) in 12 hours. If ratio of boat speed to stream speed is 3 ∶ 1, Find stream speed (in km/hr)

  1. AOption (a)

    2.25

  2. BOption (b)

    2.5

  3. COption (c)

    2.75

  4. DOption (d)

    3.25

  5. EOption (e)

    3.5

View answer & explanation

Correct answer

Answer: (c)C.

2.75

Why this answer is correct

Given:

Time for 44 km round trip = 12 hours.

Ratio of boat speed to stream speed = 3 : 1

Formula:

Speed = Distance/Time

Downstream speed = u + v

Upstream speed = u – v

u and v are speed of boat and stream respectively

Calculation:

Let speeds of boat and stream be 3x and x respectively.

44/(3x – x) + 44/(x + 3x) = 12

44/2x + 44/4x = 12

132/4x = 12

x = 2.75 km/hr

∴ The speed of stream is 2.75 km/h.

Question 503

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

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

122 + 132 – 15 × 45 ÷ 5 = 89 × ?

  1. AOption (a)

    3

  2. BOption (b)

    2

  3. COption (c)

    4

  4. DOption (d)

    1

  5. EOption (e)

    7

View answer & explanation

Correct answer

Answer: (b)B.

2

Why this answer is correct

Concept used:

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

Calculations:

122 + 132 – 15 × 45 ÷ 5 = 89 × ?

⇒ 144 + 169 – 135 = 89 × ?

⇒ 178 = 89 × ?

⇒ ? = 178/89

⇒ ? = 2 

∴ The value of ? is 2

Question 504

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

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

30% of 150 + 22 = ?2 – 50% of 30

  1. AOption (a)

    8

  2. BOption (b)

    6

  3. COption (c)

    7

  4. DOption (d)

    9

  5. EOption (e)

    10

View answer & explanation

Correct answer

Answer: (a)A.

8

Why this answer is correct

Concept used:

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

Calculations:

30% of 150 + 22 = ?2 – 50% of 30

⇒ (30/100) × 150 + 4 = ?2 – (50/100) × 30 

⇒ 45 + 4 = ?2 – 15 

⇒ ?2 = 64 

⇒ ? = √64 = 8 

∴ The value of ? is 8

Question 505

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

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

90 + 9 × 42 ÷ (119 ÷ 17) = ?

  1. AOption (a)

    154

  2. BOption (b)

    44

  3. COption (c)

    144

  4. DOption (d)

    164

  5. EOption (e)

    None of these

View answer & explanation

Correct answer

Answer: (c)C.

144

Why this answer is correct

Concept used:

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

Calculations:

90 + 9 × 42 ÷ (119 ÷ 17) = ?

⇒ 90 + 9 × 42 ÷ 7 = ?

⇒ 90 + 9 × 6 = ?

⇒ 90 + 54 = ?

⇒ 144 = ?

∴ The value of ? is 144

Question 506

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

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

∛1728 ÷ √144 + ?2 = 257

  1. AOption (a)

    256

  2. BOption (b)

    16

  3. COption (c)

    26

  4. DOption (d)

    √258

  5. EOption (e)

    None of these

View answer & explanation

Correct answer

Answer: (b)B.

16

Why this answer is correct

Concept used:

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

Calculations:

∛1728 ÷ √144 + ?2 = 257

⇒ 12 ÷ 12 + ?2 = 257

⇒ 1 + ?2= 257

⇒ ?2 = 257 – 1

⇒ ?2 = 256

⇒ ? = √256

⇒ ? = 16

∴ The value of x is 16

Question 507

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

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

 96 × 108 ÷ 24 + 169 ÷ 13 = ?

  1. AOption (a)

    465

  2. BOption (b)

    419

  3. COption (c)

    445

  4. DOption (d)

    545

  5. EOption (e)

    None of these

View answer & explanation

Correct answer

Answer: (c)C.

445

Why this answer is correct

Concept used:

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

Calculations:

96 × 108 ÷ 24 + 169 ÷ 13 = ?

⇒ 432 + 13 = ?

⇒ ? = 445

∴ The value of ? is 445

Question 508

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

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

[33 × 24] ÷ 16 × 49 – 594 = ?3

  1. AOption (a)

    7

  2. BOption (b)

    11

  3. COption (c)

    8

  4. DOption (d)

    9

  5. EOption (e)

    None of these

View answer & explanation

Correct answer

Answer: (d)D.

9

Why this answer is correct

Concept used:

Calculation:

Considering the following given question

[33 × 24] ÷ 16 × 49 – 594 = ?3

⇒ [27 × 16] ÷ 16 × 49 – 594 = ?3

⇒ [432] ÷ 16 × 49 – 594 = ?3

⇒ 432 ÷ 16 × 49 – 594 = ?3

⇒ 27 × 49 – 594 = ?3

⇒ 1323 – 594 = ?3

⇒ ?3 = 729

⇒ ? = 9

∴ ? = 9

Question 509

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

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

(6.5% of 375) – (0.85% of 230) = ?

  1. AOption (a)

    23.42

  2. BOption (b)

    24.24

  3. COption (c)

    21.64

  4. DOption (d)

    25.76

  5. EOption (e)

     22.42

View answer & explanation

Correct answer

Answer: (e)E.

 22.42

Why this answer is correct

Concept used: 

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

Calculation:

(6.5% of 375) – (0.85% of 230) = ?

⇒24.375 − 1.955 = ?

⇒ 22.42 = ?

∴ The value of ? is 22.42

Question 510

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability• Numerical Ability

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

16 + √361 – 19 + √625 + 76 = ?

  1. AOption (a)

    189

  2. BOption (b)

    117

  3. COption (c)

    122

  4. DOption (d)

    154

  5. EOption (e)

    None of these

View answer & explanation

Correct answer

Answer: (b)B.

117

Why this answer is correct

Concept Used:       

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

Calculation:

16 + √361 – 19 + √625 + 76 = ?

⇒ 16 + 19 – 19 + 25 + 76 = ?

⇒ 16 + 25 + 76 = ?

⇒ 117 = ?

∴ Result will be 117.

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