Missing Number – Railway Reasoning part – 5

Total Questions: 52

1. Find the missing number to complete the following sequence: [RRB NTPC 08/04/2021 (Evening)]

Correct Answer: (c) 6
Solution:

2. Find the missing number to complete the following sequence: [RRB NTPC 08/04/2021 (Evening)]

Correct Answer: (b) 13
Solution:

Logic -
(Multiplication of side of the both figure )
+1 Example -
In 1st figure - (5 × 4 ) + 1 = 21
In 2nd figure - (6 × 4 ) + 1 = 25
In 4th figure - (4 × 3 ) + 1 = 13

3. Find the missing number to complete the following sequence: [RRB NTPC 08/04/2021 (Evening)]

Correct Answer: (a) 5
Solution:

Logic -
1st figure - (4 × 6) + 2 = 24 + 2 = 26
2nd figure - (3 × 5) + 2 = 15 + 2 = 17
3rd figure - (3 × 1) + 2 = 3 + 2 = 5

4. Of the four given equations, the first three are solved on the basis of a certain system, where the function of → remains the same. Find the correct answer for the resolved fourth equation on the same basis [RRB NTPC 23/07/2021 (Morning)]

Correct Answer: (b) 10
Solution:

(9 × 6) ÷ 2 + 1 = 28
(7 × 4) ÷ 2 + 1 = 15
(3 × 8) ÷ 2 + 1 = 13
(3 × 6) ÷ 2 + 1 = 10

5. Find the missing number to complete the following sequence: [RRB NTPC 23/07/2021 (Evening)]

Correct Answer: (d) 3
Solution:

Here, 8 + 6 + 7 + 3 = 8 × 3
8 + 9 + 7 + 8 = 16 × 2
Therefore, 3 + 5 + 2 + 2 = 3 × 4

6. Find the missing number to complete the following sequence: [RRB NTPC 23/07/2021 (Evening)]

Correct Answer: (a) N
Solution:

E + 2 = G, G + 3 = J
J + 4 = N, N + 5 = S
S + 6 = Y, Y + 7 = F
So, F + 8 = N

7. If 96 $ 24 @ 12 = 16, and 21 @ 57 $ 19 = 24, then 36 $ 6 @ 54 = ? [RRB NTPC 24/07/2021 (Morning)]

Correct Answer: (c) 60
Solution:

96 $ 24 @ 12 = 16 ----- (i)
Putting the value of $ = ÷ and @ = +
In equation (i)...... 96 ÷ 24 + 12 = 16
4 + 12 = 16
16 = 16 (LHS = RHS )
Similarly , 36 $ 6 @ 54 = 36 ÷ 6 + 54
= 6 + 54 = 60

8. Find the missing number to complete the following sequence: [RRB NTPC 24/07/2021 (Evening)]

Correct Answer: (c) 33
Solution:

Logic : addition of bottom numbers and its divided by top number present in the triangle

9. Find the missing number to complete the following sequence: [RRB NTPC 26/07/2021 (Evening)]

Correct Answer: (d) 798
Solution:

Logic : (First no. × Second no.) - Second no
37 × 13 − 13 = 468
41 × 17 − 17 = 680
43 × 19 − 19 = 798

10. If @ + $ - # = 3 and # + @ - $ = 5, then the value of 2@ + $ - # = ? [RRB NTPC 31/07/2021 (Morning)]

Correct Answer: (c) 7
Solution:

Given , @ + $ - # = 3 ---- (i)
+ @ - $ = 5 ---- (ii)
Adding equation (i) and equation (ii) , we get 2 @ = 8 → @ = 4
Putting the value of @ in equation (i)
4 + $ - # = 3 → $ - # = -1 ---- (iii)
Similarly , 2 @ + $ - # → 8 - 1 = 7