RBI assistant prelims (14 feb) 2020 Questions and Answers Detailed Explanation
MOST IMPORTANT previous year question answers - 1 EXERCISES
The following question based on RBI assistant topic of previous year question answers
(a) 3 year younger
(b) 6 year younger
(c) 6 year older
(d) 3 year older
e) 4 year older
The correct answers to the above question in:
Answer: (d)
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Directions:
What should come in place of the question mark '?' in the following number series?
Question : 1
12, 3, 1.5, 1.5, ?, 12
a) 6
b) 3
c) 9
d) 2
e) 5
Answer »Answer: (b)
The pattern of the series is
12 ÷ 4 = 3
3 ÷ 2 = 1.5
1.5 ÷ 1 = 1.5
1.5 ÷ 1/2 = 3
3 ÷ 1/4 = 12
Question : 2
150, 153, 158, ?, 176, 189
a) 163
b) 165
c) 161
d) 167
e) 171
Answer »Answer: (b)
The pattern of the series is
150 + 3 = 153
153 + 5 = 158
158 + 7 = 165
165 + 11 = 176
176 + 13 = 189
Question : 3
1000, ?, 300, 120, 36, 7.2
a) 900
b) 640
c) 450
d) 500
e) 600
Answer »Answer: (e)
The pattern of the series is
1000 × 0.6 = 600
600 × 0.5 = 300
300 × 0.4 = 120
120 × 0.3 = 36
36 × 0.2 = 7.2
Question : 4
Abhinav bought 55 books for Rs. 1,020 from one shop and 60 books for Rs. 1,280 from another shop. What is the average price he paid per book?
a) 18.20
b) 20
c) 18
d) 20.20
e) 24
Answer »Answer: (b)
Required average ;
$= \text"1020 + 1280"/\text"55 + 60"$
$= 2300/115 = 20$
Question : 5
Speed of boat is 7.5 times of the speed of the stream. The difference between the downstream and upstream speed is 4 km/hr, then how much distance in upstream will boat cover in 1 hour?
a) 12 km
b) 17 km
c) 21 km
d) 15 km
e) 13 km
Answer »Answer: (e)
Let the speed of the stream = x km/hr, then
Speed of boat = 7.5x km/hr
According to question
(7.5x + x) – (7.5x – x) = 4
⇒ 2x = 4
⇒ x = 2
Hence, the required distance = (7.5x – x) × 1 = 6.5 × 2 = 13 km
Question : 6
There is a 120 litres mixture of milk and water in a jar. The ratio of milk and water in the jar is 5 : 3. If x litres of mixture is taken out, then the difference between milk and water in the jar is 24 litres, then find the value of x.
a) 16
b) 24
c) 18
d) 8
e) 12
Answer »Answer: (b)
In total (5 + 3) = 8 litres mixture, the difference of milk and water = 5 – 3 = 2 litres
In total (120 – x) litres mixture, the difference of milk and water = × (120 – x) = 24 litres
⇒ (120 – x) = 4 × 24
⇒ x = 120 – 96 = 24
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