IBPS RRB PO Prelims 12 sep 2020 Questions and Answers Detailed Explanation
MOST IMPORTANT previous year question answers - 1 EXERCISES
The following question based on IBPS RRB PO topic of previous year question answers
(a) 12
(b) 12.5
(c) 11
(d) 11.33
e) 10
The correct answers to the above question in:
Answer: (d)
Let the age of A be x years
Six years ago
A’s age = x – 6
A’ s uncle’s age = 6x – 36
Two years hence
A’s age = x + 2
A’s uncle ‘s age = 3x+6
A’ s uncle’s age six years ago + 8 = A’s uncle ‘s age two years hence
6x – 36 + 8 = 3x + 6
6x – 28 = 3x + 6
x = 11.33 years
Hence, the answer is D.
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Read more ibps rrb po prelims 12 sep 2020 Based Previous Year Questions and Answers
Question : 1
A person travel 124 km at the average speed of 77.5 km/hr. If he travels 60 km at the speed of 75 km/hr, then at what speed be covers the rest of the distance?
a) 75 km/hr
b) 80 km/hr
c) 60 km/hr
d) 50 km/hr
e) 90 km/h
Answer »Answer: (b)
Question : 2
Two pipes A and B can fill a tank in 24 minutes and 36 minutes. another pipe C can empty the filled tank in 18 minutes. All three pipes A, B and C are alternately open for 1 minute each in the empty tank such that pipe A is open first then pipe B and then pipe C. In what time the tank will be filled?
a) 69
b) 67
c) 201
d) 203
e) 198
Answer »Answer: (d)
Let the total capacity = 72 units (LCM of 24, 36 and 18)
Efficiency of A = $72/24$ = 3
Efficiency of B = $72/36$ = 2
Efficiency of C = –$72/18$ = –4
Number of units filled in 3 minutes = 3 + 2 – 4 = 1
So, 72 – 5 = 67 unit will be filled in 67 × 3 = 201 minutes
Remaining 5 units will be filled in the next 2 minutes
Hence, the total time = 201 + 2 = 203 minutes.
Directions:
What approximate value will come in place of the question mark (?) in the following question? (You are not expected to calculate the exact value)
Question : 3
$√{784.01} × 7.142 + 351. 99 × 24. 98 % = ?$
a) 320
b) 400
c) 240
d) 284
e) 450
Answer »Answer: (d)
? = √{784} × 7 + 352 × 25% = 28 × 7 + 88 = 196 + 88 = 284 Hence, the answer is D.
Question : 4
The ratio of speed of a boat in still water and speed of the stream is 4 : 1. If the difference of the time taken by the boat in travelling 45 km upstream and downstream is 2 hours, then speed of the stream is
a) 3 km/hr
b) 2 km/hr
c) 4 km/hr
d) 5 km/hr
e) 6 km/hr
Answer »Answer: (a)
Let speed of stream = x km/hr
Speed of boat = 4x km/hr
$45/\text"4x - x" - 45/\text"4x + x" = 2$
$45/3x - 45/5x = 2$
$1/x$(15 - 9) = 2
x = $6/2$ = 3
Hence, the speed of stream = x = 3 km/hr.
Question : 5
A and B can complete a work in 6 days. A, working alone can complete the same work in 9 days. In how many days, B alone can complete the $3/8$ of the work?
a) $25/4$
b) 9
c) $27/4$
d) $13/2$
e) 18
Answer »Answer: (c)
Let the total work = 18 units (LCM of 6 and 9)
Efciency of A and B together = $18/6$ = 3
Efciency of A alone = $18/9$ = 2
Efciency of B alone = Efciency of A and B together – Efciency of A alone
= 3 – 2 = 1
Hence, the required number of days = $3/8 x 18$ = $27/4$
Directions:
What should come in place of the question mark '?' in the following number series?
Question : 6
7, 8, 18, 57, ?, 1165
a) 220
b) 224
c) 228
d) 232
e) 236
Answer »Answer: (d)
The pattern of the series is:
7 × 1 + 1 = 8
8 × 2 + 2 = 18
18 × 3 + 3 = 57
57 × 4 + 4 = 232
232 × 5 + 5 = 1165
Hence, the answer is D.
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IBPS RRB PO Prelims 12 sep 2020
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