IBPS RRB clerk 19 sep 2020 Questions and Answers Detailed Explanation

Answer: (e)

? = 31.5 ÷ 3.5 × 12 – 8

= 9 × 12 – 8 = 100

Hence, the answer is E

Answer: (a)

2⁴ × 3³ ÷ (96 ÷ ?) = $√{324}$

⇒ 432÷ (96 ÷ ?) = 18

⇒ 24 = 96 ÷ ?

⇒ ? = 4

Hence, the answer is A.

Answer: (d)

(4$1/8$ + 6) × 16 = ? × 9

⇒ ($33/8$+ 6) × 16 = ? × 9

⇒ $81/8$× 16 = ? × 9

⇒ 162 = ? × 9

⇒ ? = 18

Hence, the answer is D.

Answer: (a)

The difference between the average of the number of TV shows watched by families D and C and half of the number of TV shows watched by family E

= $\text"20+25-35"/2$ = 5

Required percentage = $\text"24-5"/5$ × 100 = 380%

Hence, the answer is option A.

Answer: (b)

Difference between the number of TV shows watched by families A and C

= 28 – 20 = 8

Sum of the number of TV shows watched by families D and E together

= 25 + 35 = 60

Required percentage = $8/6$× 100 = 13$1/3$%

Hence, the answer is option B.

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.