Missing Number – Railway Reasoning part – 4

Total Questions: 50

1. The rectangle represents a set of calculations that are common across all the given equations. Identify the calculations involved and solve the fourth equation on the same basis: [ RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (d) (ab - 1) /b
Solution:

2. Find the missing number to complete the following sequence: [RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (a) 1
Solution:

6 × 6 = 36
4 × 8 = 32 , 7 × 2 = 14

3. Find the missing number to complete the following sequence: [RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (b) 4
Solution:

7 × 2 = 5 + 6 + 3
5 × 2 = 4 + 3 + 3
3 × 4 = 2 + 7 + 3

4. Find the missing number to complete the following sequence: [RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (a) 11
Solution:

LOGIC:-
(6 + 3 + 18) ÷ 3 = 9
(3 + 4 +17) ÷ 3 = 8
(5 + 13 + 15) ÷ 3 = 11

5. The arrow represents a set of calculations that are common across all the given equations. Identify the calculations involved and solve the fourth equation on the same basis. [RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (d) 16
Solution:

5 × 3 + 1 = 16

6. Find the missing number to complete the following sequence: [RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (b) 29
Solution:

35 + 35 = 70
33 + 42 = 75 , 49 + 31 = 80
29 + 56 = 85

7. Find the missing number to complete the following sequence: [RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (c) 40
Solution:

(3 +7) × 2 = 20
(5 + 7) × 2 =24
(4 + 16) × 2 = 40

8. Find the missing number to complete the following sequence: [RRB NTPC 23/02/2021 (Morning)]

Correct Answer: (a) 40
Solution:

3 + 6 + 4 + 5 = 18
7 + 4 + 3 + 11 = 25
10 + 12 + 5 + 13 = 40

9. Find the missing number to complete the following sequence: [RRB NTPC 27/02/2021 (Morning)]

Correct Answer: (b) C
Solution:

Logic: Sum of the place values of letters in each row = 10
J = 10, D + F = 4 + 6 = 10
G + A + B = 7 + 1 + 2 = 10
Similarly,
D + A + C + B = 4 + 1 + 3 + 2 = 10

10. Find the missing number to complete the following sequence: [RRB NTPC 27/02/2021 (Morning)]

Correct Answer: (b) 4
Solution:

7 + 5 + 3 = 15
3 + 4 + 8 = 15
Similarly,
5 + 6 + ? = 15 ⇒ ? = 4