IBPS RRB PO Prelims 12 sep 2020 Questions and Answers Detailed Explanation
MOST IMPORTANT previous year question answers - 1 EXERCISES
Directions:
What should come in place of the question mark '?' in the following number series?
The following question based on IBPS RRB PO topic of previous year question answers
(a) 111
(b) 115
(c) 100
(d) 105
e) 123
The correct answers to the above question in:
Answer: (a)
The pattern of the series is:
121 + 2 = 123
123 – (2 + 3) = 118
118 + (2 + 3 + 5) = 128
128 – (2 + 3 + 5 + 7) = 111
111 + (2 + 3 + 5 + 7 + 9) = 137
Hence, the answer is A.
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Read more ibps rrb po prelims 12 sep 2020 Based Previous Year Questions and Answers
Question : 1
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.
Question : 2
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 = $3/8 x 18$ = $27/4$
Question : 3
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 : 4
77, 85, 69, 101, 37, ?
a) 100
b) 110
c) 140
d) 155
e) 165
Answer »Answer: (e)
The pattern of the series is: 77 + 8 × 1 = 85
85 – 8 × 2 = 69
69 + 8 × 4 = 101
101 – 8 × 8 = 37
37 + 8 × 16 = 165
Hence, the answer is E.
Question : 5
20, 29, 54, 103, 184, ?
a) 315
b) 310
c) 305
d) 300
e) 295
Answer »Answer: (c)
The pattern of the series is:
20 + 32 = 29
29 + 52 = 54
54 + 72 = 103
103 + 92 = 184
184 + 112 = 305
Hence, the answer is C.
Question : 6
14, 8, 9, 14.5, 30, ?
a) 75
b) 76
c) 77
d) 78
e) 79
Answer »Answer: (b)
The pattern of the series is:
14 × .5 + 1 = 8
8 × 1 + 1 = 9
9 × 1.5 + 1 = 14.5
14.5 × 2 + 1 = 30
30 × 2.5 + 1 = 76
Hence, the answer is B.
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