Mathematical Operations – Railway Reasoning (part – 4)

Total Questions: 50

41. If ‘Q’ denotes ‘addition’, ‘J’ denotes ‘multiplication’, ‘T’ denotes ‘subtraction’ and ‘K’ denotes ‘division’, then find the value of [RRB NTPC 05/04/2021 (Evening)]

18 K 6 J 7 Q 5 T 2

Correct Answer: (c) 24
Solution:

18 K 6 J 7 Q 5 T 2
= 18 ÷ 6 × 7 + 5 - 2
= 3 × 7 + 5 - 2 = 24

42. If ‘>’ denotes ‘+’, ‘<’ denotes ‘-’, ‘+’ denotes ‘÷’, ‘^’ denotes ‘×’, ‘/’ denotes ‘=’, ‘=’ denotes ‘’, then which of the following equations is correct? [RRB NTPC 06/04/2021 (Morning)]

Correct Answer: (b) 7 > 7 < 7 + 7 = 14
Solution:

According to the question
7 > 7 < 7 + 7 = 14
7 + 7 - 7 ÷ 7 < 14
14 - 1 < 14 ⇒ 13 < 14
So, the equation(b) is correct.

43. If ‘>’ denotes ‘+’, ‘<’ denotes ‘-’, ‘+’ denotes ‘÷’, ‘^’ denotes ‘×’, ‘/’ denotes ‘=’, ‘=’ denotes ‘’, then which of the options is correct? [RRB NTPC 06/04/2021 (Morning)]

Correct Answer: (c) 8 3
Solution:

If ‘>’ denotes ‘+’, ‘<’ denotes ‘-’, ‘+’ denotes ‘÷’, ‘^’ denotes ‘×’, ‘/’ denotes ‘=’, ‘=’ denotes ‘<’ and ‘×’ denotes ‘>’,
Then from the option :
8 < 4 + 2 = 6 > 3
⇒ 8 - 4 ÷ 2 < 6 + 3 = 6 < 9 is correct.

44. If × means subtraction, - means addition, + means division and ÷ means multiplication, then find the value of [RRB NTPC 06/04/2021 (Evening)]

91 + 13 - 11 ÷ 3 × 15

Correct Answer: (b) 25
Solution:

91 + 13 - 11 ÷ 3 × 15
= 91 ÷ 13 + 11 × 3 - 15
= 7 + 33 - 15 = 40 - 15 = 25

45. If + means -, - means ÷, ÷ means ×, × means +, then what is the value of 125 - 5 × 10 ÷ 13 + 28 = ? [RRB NTPC 07/04/2021 (Evening)]

Correct Answer: (d) 127
Solution:

125 - 5 × 10 ÷ 13 + 28
= 125 ÷ 5 + 10 × 13 - 28
= 25 + 10 × 13 - 28 = 25 + 130 - 28
= 155 - 28 = 127

46. If ÷ means +, - means ÷, × means - and + means ×, then what is the value of 62 ÷ 8 - 4 × 12 + 4=? [RRB NTPC 07/04/2021 (Evening)]

Correct Answer: (b) 16
Solution:

62 ÷ 8 - 4 × 12 + 4
= 62 + 8 ÷ 4 - 12 × 4
= 62 + 2 - 48 = 64 - 48 = 16

47. If Addition means Division, Subtraction means Multiplication, Multiplication means Addition and Division means Subtraction, What will be the value of [RRB NTPC 08/04/2021 (Morning)]

13 - 2 × 4 ÷ 9 + 3?

Correct Answer: (b) 27
Solution:

13 - 2 × 4 ÷ 9 + 3
According to question,
= 13 × 2 + 4 - 9 ÷ 3
= 13 × 2 + 4 - 3 = 26 + 4 - 3
= 30 - 3 = 27

48. If A means ‘subtraction’, B means ‘addition’, C means ‘division’ and D means ‘multiplication’, then find the value of 48 B 24 C 12 D 3 A 4. [RRB NTPC 08/04/2021 (Evening)]

Correct Answer: (c) 50
Solution:

48 B 24 C 12 D 3 A 4
= 48 + 24 ÷ 12 × 3 - 4
= 48 + 2 × 3 - 4 = 48 + 6 - 4 = 50

49. If ‘S’ defines ‘×’ ‘B’ defines ‘-’, ‘R’ defines ‘+’ and ‘V’ denotes ‘÷’, then what will be the value of the following expression? [RRB NTPC 23/07/2021 (Morning)]

30 V 2 R 3 S 6 B 5

Correct Answer: (d) 28
Solution:

30 V 2 R 3 S 6 B 5
= 30 ÷ 2 + 3 × 6 - 5
= 15 + 3 × 6 - 5 = 15 + 18 - 5
= 33 - 5 = 28

50. If ‘B’ means ‘÷’, ‘D’ means ‘-’, ‘C’ means ‘+’ and ‘A’ means ‘×’, then what will be the value of the following expression? [RRB NTPC 24/07/2021 (Morning)]

10 A 4 D 16 B 2 C 6

Correct Answer: (c) 38
Solution:

10 A 4 D 16 B 2 C 6
= 10 × 4 - 16 ÷ 2 + 6 = 40 - 8 + 6
= 46 - 8 = 38