Missing Number – Railway Reasoning part – 5

Total Questions: 52

41. Find the missing number to complete the following sequence: [RRB JE 02/06/2019 (Evening)]

Correct Answer: (c) 5
Solution:

(R₁ + R₂ + R₃ )² = R₄In 1ˢᵗ column ⇒ (6 - 3) × 10 = 30
In 2ⁿᵈ column ⇒ (9 - 5) × 7 = 28
Similarly In 3ʳᵈ column ⇒ (7 - 2) × k = 25
⇒ k = 5

42. Find the missing number to complete the following sequence: [RRB JE 02/06/2019 (Evening)]

Correct Answer: (d) 43
Solution:

(R₁ + R₂ × R₃ )² = R₄
In 1ˢᵗ column ⇒ 2 + (3 × 6) = 2 + 18 = 20
In 2ⁿᵈ column ⇒ 4 + (6 × 7) = 4 + 42 = 46
Similarly In 3ʳᵈ column ⇒ 3 + (8 × 5)
= 3 + 40 = 43

43. Let 5 # 11 = 4 ; 13 # 7 = 5 ; 10 # 22 = 8. [ALP Tier II 21/01/2019 (Afternoon)]

Then find the value of 10 # 2.

Correct Answer: (b) 3
Solution:

44. If 8 # 12 = 10; 5 # 9 = 7; 6 # 10 = 8 then find the value of 14 # 4 [ALP Tier II 23/01/2019 (Morning)]

Correct Answer: (c) 9
Solution:

45. If 14 # 2 = 80, 10 # 4 = 70 and 20 6 = 130, then find the value of 8 # 12 [ALP Tier II 23/01/2019 (Afternoon)]

Correct Answer: (c) 100
Solution:

Here coding used :- # → Add then multiply by 5
14 # 2 ⇒ 14 + 2 = 16 × 5 = 80
10 # 4 ⇒ 10 + 4 = 14 × 5 = 70
20 # 6 ⇒ 20 + 6 = 26 × 5 = 130
Similarly,
8 # 12 ⇒ 8 + 12 = 20 × 5 = 100

46. 5#1=20; 11#4=35; 9#3=30; So 10#7= ? , Find the value of ? [ALP Tier II 08/02/2019 (Morning)]

Correct Answer: (d) 15
Solution:

5 # 1 = 20 → (5 - 1) × 5 = 20
11 # 4 = 35 → (11 - 4) × 5 = 35
9 # 3 = 30 → (9 - 3) × 5 = 30
Similarly, 10 # 7 = ?
→ (10 - 7) × 5 = 15
→ ? = 15

47. Find the missing number to complete the following sequence: [RRB ALP 14/08/2018 (Afternoon)]

Correct Answer: (d) 37
Solution:

In figure A
6 × 5 + 3 × 3 = 30 + 9 = 39
In figure B
7 × 5 + 4 × 4 = 51
In figure C
5 × 5 + 4 × 3 = 37

48. Find the missing number to complete the following sequence: [RRB ALP 14/08/2018 (Evening) ]

Correct Answer: (d) 36
Solution:

Logic : the number in the bottom left corner = the number in top left × the number in top right
5 × 4 = 20
3 × 8 = 24
Similarly, 9 × 4 = 36

49. Find the missing number to complete the following sequence: [RRB ALP 17/08/2018 (Afternoon)]

Correct Answer: (d) 78
Solution:

From figure A → 10 × 9 - 8 × 4 = 90 - 32 = 58
From figure B → 15 × 10 - 9 × 8 = 150 - 72 = 78

50. Find the missing number to complete the following sequence: [RRB ALP 17/08/2018 (Afternoon)]

Correct Answer: (b) 41
Solution:

From the figure A → 5 × 3 + 4 = 19
From the figure C → 6 × 4 + 5 = 29
Similarly from figure B → 7 × 5 + 6 = 41