IBPS RRB clerk 19 sep 2020 Questions and Answers Detailed Explanation

Answer: (c)

Total number of TV shows watched in the month

= 28 + 24 + 20 + 25 + 35 = 132

Hence, the answer is option C.

Answer: (e)

The difference in the number of TV shows watched by families A and C

= 28 – 20 = 8

The difference between the number of TV shows watched by families B and D

= 25 – 24 = 1

Required sum = 8 + 1 = 9

Hence, the answer is option E

Answer: (c)

Average of the number of TV shows watched by families C, A and B

= $\text"20+24+28"/3$ = 24

Average of the number of TV shows watched by families D and E

= $\text"25+35"/2$ = 30

Required Ratio = 24 : 30 = 4 : 5

Hence, the answer is option C.

Answer: (d)

Let each of A and B invested Rs. 100 and the rate of interest = 1%, then

Simple interest of A = $\text"100x1xt"/100$

= $t(SI = \text"PRT"/100)$

Simple interest of B = $\text"100x1x(t+4)"/100$

= $(t+4)(SI = \text"PRT"/100)$

According to question =$t/1 = \text"t+4"/2$

⇒ t = 4

Answer: (a)

Let the income of B = Rs. 100x,

then the income of A = 100x + 20% of 100x

= Rs. 120x

Total expenditure of A and B = 30% of (100x + 120x)

= 66x

According to question 66x = 26400

⇒ x = $26400/66$ = 400

Hence, the income of B = 100x

= 100 × 400

= Rs. 40000

Answer: (b)

Let ages of P and Q after 2 years will be 5x years and 4x years respectively

According to question

5x – 4x = 4 ⇒ x = 4

Hence, the age of Q after 2 years = 4x

= 4 × 4

= 16 years.