IBPS RRB clerk 19 sep 2020 Questions and Answers Detailed Explanation

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.

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

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

Answer: (c)

Let the cost price of the article = Rs. 100x, then

Marked price of the article = 100x + 50% of 100x = Rs. 150x

The selling price of the article = Rs. (150x – 50)

According to question

Profit = SP – CP

50 = (150x – 50) – 100x

⇒ 50 = 50x – 50

⇒ 50x = 100

⇒ x = 2

Hence, the marked price of the article = Rs. 150x

= 150 × 2

= Rs. 300.