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Question 241

RBI Assistant 2022• Numerical Ability

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

 937 + (9)3 ÷ 27 × (3)4 = ?

  1. AOption (a)

    3385

  2. BOption (b)

    3124

  3. COption (c)

    3276

  4. DOption (d)

    3390

  5. EOption (e)

    3374

View answer & explanation

Correct answer

Answer: (b)B.

3124

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 the ‘BRACKETS’ must be solved first

Step-2: Any mathematical ‘OF’ or ‘EXPONENTS’ must be solved next

Step-3: Next the part of the equation that contains ‘DIVISION; and ‘MULTIPLICATION’ are calculated

Step-4: Last but not least, the parts of the equation that contains ‘ADDITION’ and ‘SUBTRACTION’ should be calculated

Now, the given expression:

⇒ 937 + (9)3 ÷ 27 × (3)4 = ?

\(\Rightarrow 937; + ;\frac{{{{\left( 9 \right)}^3}}}{{27}}; \times ;{3^{4;}}; = ;?\)

⇒ 937 + (9)3 × 3 = ?

⇒ 937 + 729 × 3 = ?

⇒ 937 + 2187 = ?

⇒ 3124 = ?

Question 242

RBI Assistant 2022• Numerical Ability

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

5 + 5 × 5 - 5 + 5 = ?

  1. AOption (a)

    30

  2. BOption (b)

    25

  3. COption (c)

    35

  4. DOption (d)

    20

  5. EOption (e)

    40

View answer & explanation

Correct answer

Answer: (a)A.

30

Why this answer is correct

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

⇒ 5 + (5 × 5) – 5 + 5

⇒ 5 + 25 – 5 + 5

⇒ 30

Question 243

RBI Assistant 2022• Numerical Ability

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

{(3654 + 1346) × 2} ÷ 100 = ?

  1. AOption (a)

    0.1

  2. BOption (b)

    1

  3. COption (c)

    10

  4. DOption (d)

    11

  5. EOption (e)

    100

View answer & explanation

Correct answer

Answer: (e)E.

100

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.

Given expression is,

⇒ {(3654 + 1346) × 2} ÷ 100 = ?

⇒ {(5000) × 2} ÷ 100 = ?

⇒ ? = 10000 ÷ 100

⇒ ? = 100

Question 244

RBI Assistant 2022• Numerical Ability

A batsman in his 16th innings makes a score of 60 runs. This increases his average by 3. Find his average after the 16th innings.

  1. AOption (a)

    20 runs

  2. BOption (b)

    18 runs

  3. COption (c)

    12 runs

  4. DOption (d)

    14 runs

  5. EOption (e)

    15 runs

View answer & explanation

Correct answer

Answer: (e)E.

15 runs

Why this answer is correct

Given:

A batsman’s 16th innings score = 60 runs

The average increases by = 3

Calculation:

Let the average after 16th innings be x

The average after 15th innings = (x – 3)

∴ According to the question:

⇒ 16x = 15 (x – 3) + 60

⇒ 16x = 15x – 45 + 60

⇒ 16x – 15x = 15

⇒ x = 15

∴ the batsman’s average after his 16th innings is 15 runs.

Question 245

RBI Assistant 2022• Numerical Ability

A train running at a speed of 54 km/h crosses a tree in 13 seconds. In how much time will it cross 75 m long platform?

  1. AOption (a)

    15 sec

  2. BOption (b)

    16 sec

  3. COption (c)

    17 sec

  4. DOption (d)

    18 sec

  5. EOption (e)

    19 sec

View answer & explanation

Correct answer

Answer: (d)D.

18 sec

Why this answer is correct

Given:

Speed of train = 54 km/h

Time train takes to cross a tree = 13 sec

Length of a platform = 75 m

Formula used:

Speed = Distance/Time

Calculation:

Speed of the train in m/sec = 54 × (5/18) = 15 m/sec

⇒ Length of the train = 15 × 13 = 195 m

Time taken to cross the platform = (195 + 75)/15

⇒ Time taken to cross the platform = 270/15 = 18 sec

∴ The time train will take to cross the platform is 18 sec.

Question 246

RBI Assistant 2022• Numerical Ability

Direction: Following Bar graph show the number of units produced and sold by different companies.

What is the difference between the total produced and total sold units by all the companies?

  1. AOption (a)

    500

  2. BOption (b)

    560

  3. COption (c)

    550 

  4. DOption (d)

    600

  5. EOption (e)

    650

View answer & explanation

Correct answer

Answer: (b)B.

560

Why this answer is correct

Total produced units = 300 + 450 + 400 + 500 + 420 = 2070

Total sold units = 180 + 300 + 350 + 320 + 360 = 1510

⇒ required difference = 2070 – 1510 = 560

Question 247

RBI Assistant 2022• Numerical Ability

Direction: Following Bar graph show the number of units produced and sold by different companies.

If company F produces 10% more unit that was produced by company A and sells 20% fewer units that were sold by Company C. how many units of company F remain unsold?

  1. AOption (a)

    60

  2. BOption (b)

    50

  3. COption (c)

    70

  4. DOption (d)

    90

  5. EOption (e)

    80

View answer & explanation

Correct answer

Answer: (b)B.

50

Why this answer is correct

Units produced by A = 300

So, units produced by company F = 300 × 110/100 = 330

Units sold by company C = 350

So, units sold by company F = 350 × 80/100 = 280

Unsold unit of company F = 330 – 280 = 50

Question 248

RBI Assistant 2022• Numerical Ability

Direction: Following Bar graph show the number of units produced and sold by different companies.

What is the average unit of all the companies that remain unsold?

  1. AOption (a)

    118

  2. BOption (b)

    120 

  3. COption (c)

    112

  4. DOption (d)

    150

  5. EOption (e)

    130

View answer & explanation

Correct answer

Answer: (c)C.

112

Why this answer is correct

Unsold unit of company A = 120

Unsold unit of company B = 150

Unsold unit of company C = 50

Unsold unit of company D = 180

Unsold unit of company E = 60

Average unit remain unsold = (120 + 150 + 50 + 180 + 60)/5 = 112

Question 249

RBI Assistant 2022• Numerical Ability

Direction: Following Bar graph show the number of units produced and sold by different companies.

Units produced by company C is how much percent more/less than that of the units sold by company B?

  1. AOption (a)

    25%

  2. BOption (b)

    20%

  3. COption (c)

    30%

  4. DOption (d)

    33.33%

  5. EOption (e)

    37.5%

View answer & explanation

Correct answer

Answer: (d)D.

33.33%

Why this answer is correct

Unit produced by Company C = 400

Units sold by Company B = 300

⇒ Required percent = (400 -300)/300 × 100 = 33.33%

Question 250

RBI Assistant 2022• Numerical Ability

Direction: Following Bar graph show the number of units produced and sold by different companies.

What is the ratio of unsold units of Company E and D together to the sold units of company A and B together?

  1. AOption (a)

    1 : 2

  2. BOption (b)

    2 : 1

  3. COption (c)

    3 : 2

  4. DOption (d)

    4 : 3

  5. EOption (e)

    5 : 7

View answer & explanation

Correct answer

Answer: (a)A.

1 : 2

Why this answer is correct

Unsold unit of company E = 420 – 360 = 60

Unsold unit of company D = 500 – 320 = 180

Unsold units of Company E and D together = 180 + 60 = 240

Sold units of company A = 180

Sold units of company B = 300

Sold units of company A and B together = 180 + 300 = 480

⇒ required ratio = 240 : 480

⇒ 1 : 2