IBPS RRB PO Prelims 12 sep 2020 Questions and Answers Detailed Explanation
MOST IMPORTANT previous year question answers - 1 EXERCISES
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)
The following question based on IBPS RRB PO topic of previous year question answers
(a) 400
(b) 350
(c) 288
(d) 220
e) 150
The correct answers to the above question in:
Answer: (c)
? = 24 × 14 – 8 × 6
= 336 – 48 = 288
Hence, the answer is C.
Discuss Form
Read more ibps rrb po prelims 12 sep 2020 Based Previous Year Questions and Answers
Question : 1
257.12 + 187 .99 × ? = (49.98)2 + 30.99
a) 8
b) 20
c) 24
d) 36
e) 12
Answer »Answer: (e)
257.12 + 187 .99 × ? = (49.98)2 + 30.99
⇒ 257 + 188 × ? = 2500 + 31
⇒ 188 × ? = 2274
⇒ x = 12
Hence, the answer is C.
Question : 2
$2.99/3.99$ x $3√{511.99}$ + 123.9% of 650.11 = ?
a) 600
b) 700
c) 750
d) 812
e) 1000
Answer »Answer: (d)
$3/4$ x 8 + 124% of 650 = x
6 + 806 = x
812 = x
Hence, the answer is D.
Directions:
Read the following table carefully and answer the given questions.
In the table, data of number of members participating in an event from 6 sports clubs – A, B, C, D, E and F.
| Sports club | Total no. of members | % of members participated |
| A | 4000 | 65% |
| B | 9000 | 20% |
| C | 4800 | 25% |
| D | 5000 | 30% |
| E | 6000 | 35% |
| F | 6750 | 40% |
Question : 3
What is the ratio of the number of members of the sports clubs C and F, who did not participate in the event?
a) 4 : 5
b) 3 : 4
c) 5 : 9
d) 8 : 9
e) 5 : 3
Answer »Answer: (d)
The number of members of sports club C, who did not participate in the event
= (100 – 25)% of 4800 = 3600
The number of members of sports club F, who did not participate in the event
= (100 – 40)% of 6750 = 4050
Hence, the required ratio = 3600 : 4050
= 8 : 9
Question : 4
15.332 – 12.942 + 22.062 – 35.65 = ?
a) 720
b) 505
c) 402
d) 600
e) 300
Answer »Answer: (b)
? = 15.332 – 12.942 + 22.062 – 35.65
= 152 – 132 + 222 – 35
= 225 – 169 + 484 – 35
= 505.
Hence, the answer is B.
Question : 5
$√{784.01} × 7.142 + 351. 99 × 24. 98 % = ?$
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 : 6
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.
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