Missing Number – Railway Reasoning part – 2

Total Questions: 50

31. Find the missing number to complete the following sequence: [RRB NTPC 28/01/2021 (Morning)]

Correct Answer: (c) 35
Solution:

Logic-
In 1st fig. 9 + ( 3 × 2 ) = 9 + 6 = 15
In 2nd fig. 16 + (4 × 2 ) = 16 + 8 = 24
In 3rd fig. 25 + (5 × 2) = 25 + 10 = 35

32. Find the missing number to complete the following sequence: [RRB NTPC 28/01/2021 (Morning)]

Correct Answer: (b) 12
Solution:

3 × 3 = 9 and 3 + 3 = 6 is written as 96
2 × 2 = 4 and 2 + 2 = 4 is written as 44
So, 1 × 1 = 1 and 1 + 1 = 2 is written as 12

33. Find the missing number to complete the following sequence: [RRB NTPC 29/01/2021 (Evening)]

Correct Answer: (a) 4
Solution:

(6× 4) ÷ (3 × 2) = 4
(6 × 3) ÷ (3 × 1) = 6
(4 × 10) ÷ (2 × 5) = 4

34. If 14 + 13 × 3 = 81, then 17 + 16 × 2 = ? [RRB NTPC 29/01/2021 (Evening)]

Correct Answer: (c) 66
Solution:

14 + 13 = 27 × 3 = 81
17 + 16 = 33 × 2 = 66

35. Find the missing number to complete the following sequence: [RRB NTPC 30/01/2021 (Evening)]

Correct Answer: (c) 13
Solution:

(5 × 6) + 5 = 30 + 5 = 35
(8 × 11) + 8 = 88 + 8 = 96
(15 × X ) + 15 = 210 ⇒ X = 13

36. Find the missing number to complete the following sequence: [RRB NTPC 30/01/2021 (Evening)]

Correct Answer: (c) 10
Solution:

For 1ˢᵗ diagram → (Addition of 4, 6 & 8 = 18) - (2 + 3 = 5) = 13
For 2ⁿᵈ diagram → (Addition of 2, 4 & 6 = 12 ) - (3 + 5 = 8) = 4
Similarly
For 3ʳᵈ diagram → (Addition of 9, 4 & 7 = 20 ) - (8 + 2 = 10) = 10

37. Find the missing number to complete the following sequence: [RRB NTPC 31/01/2021 (Morning)]

Correct Answer: (a) 23
Solution:

In 1st column = 18 - 16 ⇒ 2 ⇐ 19 - 17
2nd column = 25 - 20 ⇒ 5 ⇐ 23 - 18
3rd column = 31 - 12 ⇒ 19 ⇐ 26 - 7

38. Find the missing number to complete the following sequence: [RRB NTPC 31/01/2021 (Morning)]

Correct Answer: (d) 33
Solution:

Logic :- In each row , (3rd term) × (2nd term) + (1st term) = (resultant value )
7 × 6 + 4 = 46
8 × 8 + 6 = 70
6 × 5 + 3 = 33

39. Find the missing number to complete the following sequence: [RRB NTPC 31/01/2021 (Evening)]

Correct Answer: (b) 32
Solution:

64 - 48 = 16 × 5 = 80
32 - 24 = 8 × 5 = 40
16 - 12 = 4 × 5 = 20

40. Find the missing number to complete the following sequence: [RRB NTPC 01/02/2021 (Morning)]

Correct Answer: (b) 4
Solution:

( 5 × 2 ) + ( 7 × 6 ) = 10 + 42 = 52
( 8 × 5 ) + ( 3 × 2 ) = 40 + 6 = 46
Similarly ( 4 × 4 ) + ( 8 × 2 ) = 32