Mathematical Operations – Railway Reasoning (part – 2)

Total Questions: 50

41. If ‘+’ means ‘x’, ‘-’ means ‘÷’, ‘x’ means ‘-’ and ‘÷’ means ‘+’, then which number will replace the question mark (?) in the following expression? [Group - D 22/09/2022 (Morning)]

11 + 35 - 5 × 8 ÷ 3 = ?

Correct Answer: (c) 72
Solution:

Given expression:
11 + 35 - 5 × 8 ÷ 3
After changing the symbols,
11 × 35 ÷ 5 - 8 + 3
= 11 × 7 - 8 + 3 = 77 - 8 + 3 = 72

42. If ‘+’ and ‘-’ are interchanged, what will be the value of the given expression? [Group - D 22/09/2022 (Morning)]

18 - 6 + 14 × 10 ÷ 5

Correct Answer: (d) 138
Solution:

After interchanging symbols ,
18 ÷ 6 + 14 × 10 - 5
⇒ 3 + 140 - 5 ⇒ 143 - 5 = 138

43. What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘-’ are interchanged and also ‘×’ and ‘÷’ are interchanged? [Group - D 22/09/2022 (Afternoon)]

60 - 72 × 5 ÷ 3 = ?

Correct Answer: (a) 27
Solution:

Given expression :
60 - 72 × 6 + 15 ÷ 3
After changing the symbols,
60 + 72 ÷ 6 - 15 × 3
= 60 + 12 - 45 = 72 - 45 = 27

44. If the signs + and × are interchanged, and the numbers 3 and 7 are also interchanged, which of the following four equations given as options would be correct? [Group - D 22/09/2022 (Evening)]

Correct Answer: (a) 3 + 7 × 9 = 30
Solution:

By hit and trial method check each options one by one, Option (a) satisfies itself.
3 + 7 × 9 = 30
By interchange sign and number;
7 × 3 + 9 = 30

45. If the position of the digit ‘2’ is interchanged with the position of the digit ‘4’, and the position of the ‘5’ is interchanged with the position of the digit ‘3’, what is the value of the given expression ? [Group - D 26/09/2022 (Morning)]

47 + 56 × 6 – 2 × 3

Correct Answer: (a) 13 
Solution:

Given expression :
47 + 56 ÷ 6 - 2 × 3
After interchanging the symbols and numbers
27 + 36 ÷ 6 - 4 × 5 = 27 + 6 - 20 = 13

46. If ‘x’ means ‘-’, ‘+’ means ‘÷’, ‘-’ means ‘+’, and ‘÷’ means ‘x’, what will be the value of the following expression? [Group - D 26/09/2022 (Afternoon)]

[(12 – 2) × (3 ÷ 2)) + (12 × 4)]

Correct Answer: (b) 1
Solution:

Given expression :
[{(12 - 2) × (3 ÷ 2)} + (12 × 4)]
After changing the symbols,
[{(12 + 2) - (3 × 2)} ÷ (12 - 4)]
= [{14 - 6} ÷ 8] = 8 ÷ 8 = 1

47. If ‘–’ means ‘×’, ‘×’ means ‘+’, ‘+’ means ‘÷’, ‘÷’ means ‘–’, what will come in place of the question mark (?) in the following equation? [Group - D 26/09/2022 (Evening)]

5 – 5 ÷ 6 × 6 + 3 = ?

Correct Answer: (b) 21
Solution:

Given expression :
5 - 5 ÷ 6 × 6 + 3
After changing the symbols,
5 × 5 - 6 + 6 ÷ 3 = 25 - 6 + 2 = 21

48. If ‘+’ means ‘÷’, ‘-’ means ‘×’, ‘×’ means ‘+’, and ‘÷’ means ‘-’, what will come in place of the question mark (?) in the following equation? [Group - D 26/09/2022 (Evening)]

45 + 9 – 4 × 15 ÷ 2 = ?

Correct Answer: (d) 33
Solution:

Given expression :
45 + 9 - 4 × 15 ÷ 2
After interchanging the symbols,
45 ÷ 9 × 4 + 15 - 2
= 5 × 4 + 15 - 2 = 20 + 15 - 2 = 33

49. What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘-’ are interchanged and also ‘×’ and ‘÷’ are interchanged? [Group - D 27/09/2022 (Morning)]

28 ÷ 12 + 18 × 6 + 4 = ?

Correct Answer: (b) 329
Solution:

Given expression :
28 ÷ 12 + 18 × 6 + 4
According to the given instructions ‘+’ and ‘-’ are interchanged and ‘x’ and ‘÷’ are interchanged
28 × 12 - 18 ÷ 6 - 4 = 336 - 3 - 4 = 329

50. If ‘–’ means ‘+’, ‘+’ means ‘×’, ‘×’ means ‘÷’, ‘÷’ means ‘–’, what will come in place of the question mark (?) in the following equation? [Group - D 27/09/2022 (Evening)]

3 ÷ 8 × 2 + 1 – 5 = ?

Correct Answer: (b) 4
Solution:

3 ÷ 8 × 2 + 1 - 5
After interchanging symbols,
= 3 - 8 ÷ 2 × 1 + 5 = 3 - 4 + 5 = 4