IBPS RRB PO Prelims 12 sep 2020 Questions and Answers Detailed Explanation
MOST IMPORTANT previous year question answers - 1 EXERCISES
Directions:
Read the chart carefully and answer the following questions.
Given pie-chart shows the percentage distribution of total items sold by six Indian companies in any year.
![IBPS RRB PO Prelims 2020](/adminicon/bunch/images/ibps-rrb-po-prelims-12-sep-66-70a.png)
The following question based on IBPS RRB PO topic of previous year question answers
(a) 10982
(b) 12432
(c) 14508
(d) 11204
e) 14454
The correct answers to the above question in:
Answer: (c)
Items manufactured by India = 97500 – 3900
= 93600
Required average = 93600 x $\text"16 + 15"/100$ x $1/2$
= 14508
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Read more ibps rrb po prelims 12 sep 2020 Based Previous Year Questions and Answers
Question : 1
Find the ratio between items sold by B to that of items sold by E
a) 16 : 17
b) 16 : 19
c) 17 : 18
d) 18 : 19
e) 15 : 16
Answer »Answer: (a)
Required Ratio = 16 : 17
Question : 2
If total items manufactured by India is 11160 and defective items are 840 then find the items sold by C is how much more or less than E? (items which are defective cannot be sold)
a) 426
b) 516
c) 624
d) 712
e) 564
Answer »Answer: (b)
Total items which can be sold =11160-840=10320
Required difference = $\text"17 - 12"/100 x 10320$ = 516
Directions:
Given below are two quantities named I and II. Based on the given information, you have to determine the relation between the two quantities. You should use the given data and your knowledge of Mathematics to choose among the possible answers.
Calculate quantity I and quantity II on the basis of the given information then compare them and answer the following questions accordingly.
Question : 3
- Quantity I:
- Present ages of A and B are in the ratio of 4: 5 respectively. Present ages of C and D are in the ratio of 5: 6 respectively. The present average age of A, B, C and D is 40 years and 6 months. Age of A after 2 years will be half the age of D 6 years hence. Find the present average age of B and C.
- Quantity II:
- 39 years
a) Quantity I > Quantity II
b) Quantity I < Quantity II
c) Quantity I ≥ Quantity II
d) Quantity I ≤ Quantity II
e) Quantity I = Quantity II or No relation
Answer »Answer: (b)
Quantity I:
Let the present ages of A and B are 4x and 5x years respectively and the present ages of C and D are 5y and 6y years respectively.
So, sum of the ages of A, B, C and D = 4x + 5x + 5y + 6y = 40.5 x 4
So, 9x + 11y = 162
Also given that,
2 x (4x+2) = 6y + 6
So, 4x – 3y = 1
From both the equation, we get,
x = 7 and y = 9
So, the present ages of A, B, C and D are 28, 35, 45 and 54 respectively.
The present average age of B and C = $\text"35 + 45"/2$ = 40 years
Quantity II: 39
Therefore, Quantity I > Quantity II
So option (a) is the correct answer.
Question : 4
If total items manufactured by India is 42000, then find items sold by F is what per cent more or less than items sold by D?
a) 60%
b) 66$2/3$%
c) 40%
d) 33$1/3$%
e) 25%
Answer »Answer: (d)
Required percentage = $\text"20 - 15"/15 x 100$
= 33$1/3$%
Question : 5
If items manufactured by Pakistan is 50400 which is 20% more than items manufactured by India, then nd difference of items sold by C and E?
a) 2600
b) 2400
c) 1800
d) 1600
e) 2100
Answer »Answer: (e)
items manufactured by India = 50400 x $100/120$ = 42000
Required Difference = 42000 x $\text"17 - 12"/100$
= 2100
Question : 6
A and B together take 6 days to complete a work. If it is given that A takes 9 days less than B to complete the work alone, then in how many days B alone will complete the work?
a) 18
b) 15
c) 12
d) 9
e) 8
Answer »Answer: (a)
Let the minimum of days taken by B alone to complete the work be x days.
Number of days taken day A alone to complete the work
= x – 9 days
$1/x + 1/\text"x - 9" = 1/6$
$\text"x(x - 9)"/\text"2x - 9" = 6$
x2 - 9x = 12x - 54
x2 - 21x + 54 = 0
x2 - 18x -3x + 54 = 0
x(x - 18) -3(x - 18) = 0
(x - 3)(x - 18) = 0
x = 3 , 18
X cannot be 3 as the number of days can’t be negative for any person
x = 18 days
Number of days taken by B alone = x = 18 days
Hence, the answer is A.
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