Missing Number – Railway Reasoning part – 5

Total Questions: 52

21. Find the missing number to complete the following sequence: [RRB JE 24/05/2019 (Evening)]

Correct Answer: (a) 25
Solution:

Here logic column wise :-

22. If 53 * 13 = 33, 39 * 13 = 26 and 74 * 26 = 50, then what will be 37 * 21 ? [RRB JE 25/05/2019 (Morning)]

Correct Answer: (d) 29
Solution:

23. Find the missing number to complete the following sequence: [RRB JE 25/05/2019 (Morning)]

Correct Answer: (b) 126
Solution:

Logic :- [ a+b = c ]
15 + 75 = 90
18 + 90 = 108
Similarly, 21 + 105 = 126

24. Find the missing number to complete the following sequence: [RRB JE 25/05/2019 (Morning)]

8 (246) 3
3 (213) 7
3 (???) 5

Correct Answer: (c) 156
Solution:

8 (246) 3 ⇒ 8 × 3 = 24 and 2 + 4 = 6
3 (213) 7 ⇒ 3 × 7 = 21 and 2 + 1 = 3
Similarly, 3(156)5 = 3 × 5
= 15 and 1 + 5 = 6

25. If 8 # 2 @ 4 = 12 and 5 # 4 @ 2 = 18, then what will be 4 # 8 @ 3 ? [RRB JE 25/05/2019 (Afternoon)]

Correct Answer: (b) 29
Solution:

Here coding are # → × and @ → -
8 × 2 - 4 ⇒ 16 - 4 = 12
5 × 4 - 2 ⇒ 20 - 2 = 18
Similarly, 4 × 8 - 3 ⇒ 32 - 3 = 29

26. Find the missing number to complete the following sequence: [RRB JE 25/05/2019 (Afternoon)]

Correct Answer: (c) 39
Solution:

(5 × 6) - (5 + 6 + 1) = 18
(9 × 5) - (9 + 5 + 4) = 27
Similarly, (7 × 8) - (7 + 8 + 2) = 39

27. If 14 * 64 = 39, 25 * 37 = 31 and 9 * 17 = 13, then what will be 52 * 46 ? [RRB JE 25/05/2019 (Afternoon)]

Correct Answer: (a) 49
Solution:

28. Find the missing number to complete the following sequence: [RRB JE 25/05/2019 (Evening)]

Correct Answer: (d) 8
Solution:

                              Logic row wise :-

29. If 9 # 3 @ 4 = 31 and 8 # 7 @ 2 = 58, then what will be 5 # 6 @ 7 ? [RRB JE 25/05/2019 (Evening)]

Correct Answer: (b) 37
Solution:

Here, # = × and @ = +
So 9 × 3 + 4 ⇒ 27 + 4 = 31
8 × 7 + 2 ⇒ 56 + 2 = 58
Similarly, 5 × 6 + 7 ⇒ 30 + 7 = 37

30. Find the missing number to complete the following sequence: [RRB JE 26/05/2019 (Afternoon)]

Correct Answer: (c) 112
Solution: