IBPS RRB clerk 19 sep 2020 Questions and Answers Detailed Explanation
MOST IMPORTANT previous year question answers - 1 EXERCISES
The following question based on IBPS RRB Clerk topic of previous year question answers
(a) 32 years
(b) 48 years
(c) 54 years
(d) 62 years
e) 66 years
The correct answers to the above question in:
Answer: (c)
Let the present age of A = A years and present age of B = B years, then
(A + 10) + (B + 10) = 106
⇒ B = 106 – 10 – 10 – A = 86 – A …. (i)
According to question
A – 6 = B + 16 ⇒ B = A – 6 – 16 = A – 22 …. (ii)
From equations (i) and (ii), we get
86 – A = A – 22
⇒ 2A = 86 + 22
⇒ A = $108/2$ = 54.
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Read more ibps rrb clerk prelims 19 sep 2020 Based Previous Year Questions and Answers
Question : 1
The circumference of a circle is 2 cm more than the perimeter of the rectangle and the length of the rectangle is equal to the diameter of the circle. If the breadth of the rectangle is half of the diameter of the circle, what is the radius of the circle?
a) 7 cm
b) 2 cm
c) 4 cm
d) 14 cm
e) 21 cm
Answer »Answer: (a)
Let the radius of the circle = r cm, then
Length of the rectangle = Diameter of circle = 2r cm
The breadth of the rectangle = Half of the diameter of circle = r cm
According to question
Circumference of a circle – Perimeter of rectangle = 2 cm
2πr– 2(2r + r) = 2
⇒ πr – 3r = 1
⇒ r($22/7$ – 3) = 1
⇒ r = 7
Question : 2
A and B start a business by investing Rs. X and Rs. (X + 800) respectively. After 1 year, A earned a profit of Rs. 3200 out of the total profit of Rs. 6800, then what is the value of X?
a) 3200
b) 4000
c) 6400
d) 7200
e) 8000
Answer »Answer: (c)
As both A and B invested for the same time period, then
The ratio of their profit = Ratio of their investment
$X/3200 = \text"X + 800"/\text"6800 - 3200"$
$X/3200 = \text"X + 800"/\text"3600"$
⇒ 9X = 8(X + 800)
⇒ X = 8 × 800 = 6400
Question : 3
A boat travels upstream at the speed of 10 km/hr for t hours and downstream at the speed of 14 km/hr for 6 hours. If the distance travelled in downstream direction is 44 km more than that in upstream direction, then what is the value of t?
a) 7
b) 2
c) 3
d) 4
e) 6
Answer »Answer: (d)
Distance = Speed × Time
The distance travelled in downstream direction
= 14 × 6 = 84 km
The distance travelled in upstream direction
= 10 × t = 10t km
According to question
84 – 10t = 44
⇒ 10t = 84 – 44 = 40
⇒ t = $40/10$ = 4
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