RBI assistant prelims (14 feb) 2020 Questions and Answers Detailed Explanation

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Questions : Speed of boat is 7.5 times of the speed of the stream. The difference between the downstream and upstream speed is 4 km/hr, then how much distance in upstream will boat cover in 1 hour?

(a) 12 km

(b) 17 km

(c) 21 km

(d) 15 km

e) 13 km

The correct answers to the above question in:

Answer: (e)

Let the speed of the stream = x km/hr, then

Speed of boat = 7.5x km/hr

According to question

(7.5x + x) – (7.5x – x) = 4

⇒ 2x = 4

⇒ x = 2

Hence, the required distance = (7.5x – x) × 1 = 6.5 × 2 = 13 km

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Read more rbi assistant prelims 14 feb 2020 Based Previous Year Questions and Answers

Question : 1

Abhinav bought 55 books for Rs. 1,020 from one shop and 60 books for Rs. 1,280 from another shop. What is the average price he paid per book?

a) 18.20

b) 20

c) 18

d) 20.20

e) 24

Answer: (b)

Required average ;

$= \text"1020 + 1280"/\text"55 + 60"$

$= 2300/115 = 20$

Question : 2

Five years ago, Amu’s age is equal to Xia’s age 4 years hence. Zara’ present age is 6 years more than Xia’s then find by how many years Amu is younger/older than Zara?

a) 3 year younger

b) 6 year younger

c) 6 year older

d) 3 year older

e) 4 year older

Answer: (d)

Directions:

What should come in place of the question mark '?' in the following number series?

[RBI (Assistant) Prelims 2020]

Question : 3

12, 3, 1.5, 1.5, ?, 12

a) 6

b) 3

c) 9

d) 2

e) 5

Answer: (b)

The pattern of the series is
12 ÷ 4 = 3
3 ÷ 2 = 1.5
1.5 ÷ 1 = 1.5
1.5 ÷ 1/2 = 3
3 ÷ 1/4 = 12

Question : 4

There is a 120 litres mixture of milk and water in a jar. The ratio of milk and water in the jar is 5 : 3. If x litres of mixture is taken out, then the difference between milk and water in the jar is 24 litres, then find the value of x.

a) 16

b) 24

c) 18

d) 8

e) 12

Answer: (b)

In total (5 + 3) = 8 litres mixture, the difference of milk and water = 5 – 3 = 2 litres

In total (120 – x) litres mixture, the difference of milk and water = × (120 – x) = 24 litres

⇒ (120 – x) = 4 × 24

⇒ x = 120 – 96 = 24

Question : 5

If the marked price of an article is 60% above the cost price. The article is sold at 25% discount. If the profit obtained is Rs. 40 then find the marked price of the article.

a) Rs. 320

b) Rs. 240

c) Rs. 200

d) Rs. 300

e) Rs. 360

Answer: (a)

Let the cost price = 100x, them

Marked price = 160x and Selling price = 160x – 25% of 160x = 160x – 40x = 120x

According to question

120x – 100x ≡ Rs. 40

20x ≡ Rs. 40

Hence, the marked price = 160x ≡ 20x × 8 = Rs. 40 × 8 = Rs. 320

Directions:

Study the following data carefully and answer the questions accordingly.

Nine people A, B, C, D, E, F, G, H, and J have their joining in a particular company in different months i.e. January, February, May, June, July , September, October, November, and December of the same year but not necessarily in the same order. H does not have the joining in the month which has 31 days. C has the joining after A. Two people have the joining between A and F. E has the joining after J. D has the joining before June, but not in the month which has more than 30 days. G has the joining before H. Two people have the joining between B and C and both have the joining before E. Three people have the joining between E and A. Four people have the joining between J and D.

[RBI (Assistant) Prelims 2020]

Question : 6

How many of them joined the company between the joining of D and J?

a) Five

b) Three

c) Six

d) Four

e) None is correct

Answer: (d)

1) D has the joining before June, but not in the month which has more than 30 days.

2) Four people have the joining between J and D.

Months Persons
Jan  
Feb D
May  
Jun  
Jul  
Sep  
Oct J
Nov  
Dec  

3) E has the joining after J.

Case 1 Case 2
Months Persons Months Persons
Jan   Jan  
Feb D Feb  D
May   May  
Jun   Jun  
Jul   Jul  
Sep   Sep  
Oct J Oct
Nov E Nov  
Dec   Dec

4) Three people have the joining between E and A.

5) Two people have the joining between A and F.

Case 1 Case 2
Months Persons Months Persons
Jan F Jan  
Feb D Feb D
May   May  
Jun A Jun  
Jul   Jul A
Sep   Sep  
Oct J Oct
Nov  E Nov F
Dec   Dec

6) Two people have the joining between B and C and both have the joining before E.

7) C has the joining after A.

Case 1 Case 2
Months Persons Months Persons
Jan F Jan  
Feb D Feb D
May B May B
Jun A Jun  
Jul   Jul A
Sep C Sep C
Oct J Oct
Nov  E Nov F
Dec   Dec

8) G has the joining before H.

Case 1 Case 2
Months Persons Months Persons
Jan F Jan G
Feb D Feb D
May B May B
Jun A Jun H
Jul G Jul A
Sep C Sep C
Oct J Oct
Nov  E Nov F
Dec H Dec

9) H does not have the joining in the month which has 31 days.

(Here, case 1 will be eliminated)

Months Persons
Jan G
Feb D
May B
Jun H
Jul A
Sep C
Oct J
Nov F
Dec E

 Therefore, option D is the correct answer.

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RBI assistant prelims (14 feb) 2020

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