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Question 481

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

The table shows the number of red and green balls in five different bags.

BagNumber of red ballNumber of green balls
A3444
B4238
C6422
D2862
E7228

Difference between number of green balls in Bag D and C is 5t. Find the value of t?​

  1. AOption (a)

    1

  2. BOption (b)

    8

  3. COption (c)

    6

  4. DOption (d)

    4

  5. EOption (e)

    3

View answer & explanation

Correct answer

Answer: (b)B.

8

Why this answer is correct

Calculations:

Difference between green balls in Bag D and Bag C:

Bag D green = 62

Bag C green = 22

Difference = 62 – 22 = 40 =5t

So, t = 40 / 5 = 8

Question 482

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

The table shows the number of red and green balls in five different bags.

BagNumber of red ballNumber of green balls
A3444
B4238
C6422
D2862
E7228

Find the ratio between number of red balls in bag A and number of green balls in Bag B?

  1. AOption (a)

    5:9

  2. BOption (b)

    7:11

  3. COption (c)

    17:19

  4. DOption (d)

    7:9

  5. EOption (e)

    11:19

View answer & explanation

Correct answer

Answer: (c)C.

17:19

Why this answer is correct

Calculations:

Ratio of red balls in Bag A to green balls in Bag B:

Red in A = 34

Green in B = 38

Ratio = 34 : 38 = 17 : 19

Question 483

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

The table shows the number of red and green balls in five different bags.

BagNumber of red ballNumber of green balls
A3444
B4238
C6422
D2862
E7228

Find the total number of balls in bag E?

  1. AOption (a)

    95

  2. BOption (b)

    180

  3. COption (c)

    185

  4. DOption (d)

    100

  5. EOption (e)

    120

View answer & explanation

Correct answer

Answer: (d)D.

100

Why this answer is correct

Calculations:

Total number of balls in Bag E:

Red = 72

Green = 28

Total = 72 + 28 = 100

Question 484

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

The table shows the number of red and green balls in five different bags.

BagNumber of red ballNumber of green balls
A3444
B4238
C6422
D2862
E7228

Find the difference between number of red balls in bag B and number of red balls in Bag E?

  1. AOption (a)

    74

  2. BOption (b)

    62

  3. COption (c)

    55

  4. DOption (d)

    30

  5. EOption (e)

    32

View answer & explanation

Correct answer

Answer: (d)D.

30

Why this answer is correct

Calculations:

Bag E red = 72

Bag B red = 42

Difference = 72 – 42 = 30

Question 485

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

The table shows the number of red and green balls in five different bags.

BagNumber of red ballNumber of green balls
A3444
B4238
C6422
D2862
E7228

Find the average number of green balls in Bag A, B and E?

  1. AOption (a)

    46.67

  2. BOption (b)

    45.69

  3. COption (c)

    36.67

  4. DOption (d)

    32.67

  5. EOption (e)

    39.67

View answer & explanation

Correct answer

Answer: (c)C.

36.67

Why this answer is correct

Calculations:

Average green balls in Bags A, B, and E:

Green in A = 44

Green in B = 38

Green in E = 28

Total = 44 + 38 + 28 = 110

Average = 110 ÷ 3 = 36.67

Question 486

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

A running train crosses a stationary pole in 4 seconds and a platform 75m long in 9 seconds. what will be the speed and length of the train respectively?

  1. AOption (a)

    45 km/hr. and 100m

  2. BOption (b)

    30 km/hr. and 150m

  3. COption (c)

    54 km/hr. and 60m

  4. DOption (d)

    63 km/hr. and 225m

  5. EOption (e)

    none of these

View answer & explanation

Correct answer

Answer: (c)C.

54 km/hr. and 60m

Why this answer is correct

Given:

Time to cross the pole = 4 seconds

Time to cross the 75m platform = 9 seconds

Calculation:

Let the speed of train be x m/sec.

And length of train = L m

When train crosses the pole:

L = 4x 

When train crosses the platform:

L + 75 = 9x

Put L = 4x

4x + 75 = 9x

5x = 75

x = 15 m/sec = 15 × 18/5 = 54 km/hr

L = 4 × 15 = 60 m

∴The speed and length of train is 54 km/hr. and 60m respectively.

Question 487

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

12 men and 15 women can complete a work in 24 days. If the efficiency of a woman is 75% of a man, then to complete the work in 12 days how many men are required?

  1. AOption (a)

    105/2

  2. BOption (b)

    89/2

  3. COption (c)

    57/2

  4. DOption (d)

    79/2

  5. EOption (e)

    93/2

View answer & explanation

Correct answer

Answer: (e)E.

93/2

Why this answer is correct

Given:

12 men and 15 women can complete a work in 24 days

The efficiency of a woman is 75% of a man

Concept Used:

Work done = efficiency × time

Calculation:

Let, the efficiency of a man = 4

The efficiency of a woman = 4 × 3/4 = 3

Total work = [(12 × 4) + (15 × 3)] × 24 = (93 × 24) unit

To complete the work in 12 days number of men required are

⇒ (93 × 24)/(12 × 4)

⇒ 93/2

∴ The correct answer is option 5

Question 488

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

Find out the wrong term in the following series.

74, 99, 50, 125, 10, 179

  1. AOption (a)

    74

  2. BOption (b)

    125

  3. COption (c)

    10

  4. DOption (d)

    179

  5. EOption (e)

    50

View answer & explanation

Correct answer

Answer: (b)B.

125

Why this answer is correct

Calculation:

The series is

74 + 25= 99

99 – 49 = 50

50 + 81 = 131

131 – 121 = 10

10 + 169 = 179

∴ 125 is the wrong number in the series.

Question 489

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

Find out the wrong term in the following series.

38, 38, 57, 114, 284, 855

  1. AOption (a)

    284

  2. BOption (b)

    114

  3. COption (c)

    57

  4. DOption (d)

    855

  5. EOption (e)

    None of these

View answer & explanation

Correct answer

Answer: (a)A.

284

Why this answer is correct

Calculation:

The series is

38 × 1 = 38

38 × 1.5 = 57

57 × 2 = 114

114 × 2.5 = 285

285 × 3 = 855

∴ 284 is wrong number in the series.

Question 490

IBPS RRB Office Assistant (Clerk) 2025• Numerical Ability

In each of the following number series, the wrong number is given, find out that number.

65, 126, 219, 347, 517, 735

  1. AOption (a)

    219

  2. BOption (b)

    347

  3. COption (c)

    735

  4. DOption (d)

    126

  5. EOption (e)

    517

View answer & explanation

Correct answer

Answer: (d)D.

126

Why this answer is correct

The series follows the following pattern:

43 + 1 = 65

53 + 2 = 127

63 + 3 = 219

73 + 4 = 347

83 + 5 = 517

93 + 6 = 735

∴ The wrong term in the series is 126.

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