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) 720
(b) 505
(c) 402
(d) 600
e) 300
The correct answers to the above question in:
Answer: (b)
? = 15.332 – 12.942 + 22.062 – 35.65
= 152 – 132 + 222 – 35
= 225 – 169 + 484 – 35
= 505.
Hence, the answer is B.
Discuss Form
Read more ibps rrb po prelims 12 sep 2020 Based Previous Year Questions and Answers
Question : 1
24.002 × 14.005 – 7.775 × 5.964 = ?
a) 400
b) 350
c) 288
d) 220
e) 150
Answer »Answer: (c)
? = 24 × 14 – 8 × 6
= 336 – 48 = 288
Hence, the answer is C.
Question : 2
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 : 3
$2.99/3.99$ 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.
Question : 4
$√{784.01} × 7.142 + 351. 99 × 24. 98 % = ?$
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 : 5
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.
Question : 6
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)
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