If you’ve ever found yourself staring at a logical reasoning question, feeling a mix of curiosity and confusion, you’re not alone. I remember helping my nephew prepare for his entrance exams. We’d sit at the kitchen table, and his eyes would glaze over at yet another series or coding puzzle. “Why do I need to know this?” he’d ask. The truth is, these questions aren’t just about finding the right answer; they’re about training your brain to think clearly, spot patterns, and solve problems efficiently—skills that are invaluable in any career.
Based on my years of tutoring and creating study materials, I’ve put together a set of 25 foundational reasoning questions. Think of this as a friendly brain workout. I’ll walk you through each one, just like I did with my nephew, breaking down the logic in a way that actually makes sense. Let’s dive in.
25 Logical Reasoning Questions & Answers (With Simple Explanations)
Q1. Letter Values
If A = 1, B = 2, C = 3, …, Z = 26, what is the sum of the numerical values of the letters in the word “FOREST”?
- (a) 68
- (b) 72
- (c) 76
- (d) 80
Answer: (b) 72
Explanation: This is a straightforward conversion. F=6, O=15, R=18, E=5, S=19, T=20. Adding them: 6 + 15 + 18 + 5 + 19 + 20 = 72.
Q2. Number Series
Which number should replace the question mark in the series: 2, 6, 12, 20, ?, 42?
- (a) 28
- (b) 30
- (c) 32
- (d) 34
Answer: (b) 30
Explanation: Look at the pattern between consecutive numbers: 2 to 6 is +4, 6 to 12 is +6, 12 to 20 is +8. The increments are increasing by 2 each time. So, the next increment should be +10. 20 + 10 = 30. Checking further, 30 to 42 is +12, which fits the pattern perfectly.
Q3. Coding-Decoding
In a certain code language, each letter is replaced by the letter that comes two places after it in the English alphabet (A→C, B→D, …, Y→A, Z→B). How will the word “GROVE” be coded?
- (a) ITQXG
- (b) ITQXF
- (c) ITQYG
- (d) ITQYF
Answer: (a) ITQXG
Explanation: Apply the rule to each letter: G (+2) = I, R (+2) = T, O (+2) = Q, V (+2) = X, E (+2) = G. So, the code is ITQXG.
Q4. Odd One Out
Find the odd one out:
- (a) Triangle
- (b) Square
- (c) Pentagon
- (d) Circle
Answer: (d) Circle
Explanation: A triangle, square, and pentagon are all polygons—closed shapes made of straight line segments. A circle is a curved shape with no straight sides, making it the odd one out.
Q5. Clock Problems
A clock gains 5 minutes every hour. If it was set correctly at 8:00 AM, what will be the true time when the clock shows 1:00 PM on the same day?
- (a) 12:35 PM
- (b) 12:40 PM
- (c) 12:45 PM
- (d) 12:50 PM
Answer: (a) 12:35 PM
Explanation: From 8:00 AM to 1:00 PM, the faulty clock shows 5 hours have passed. Since it gains 5 minutes every hour, in 5 hours it gains 5 x 5 = 25 minutes. This means the clock is 25 minutes ahead of the real time. So, when it shows 1:00 PM, the true time is 25 minutes less: 12:35 PM.
Q6. Direction Sense
A person walks 8 km north, then turns right and walks 6 km, then turns left and walks 4 km, then turns left again and walks 6 km. How far is he from the starting point?
- (a) 8 km
- (b) 10 km
- (c) 12 km
- (d) 14 km
Answer: (c) 12 km
Explanation: Let’s track his movement. Start at point O. 8 km north to A. Turn right (east) and walk 6 km to B. Turn left (north) and walk 4 km to C. Turn left (west) and walk 6 km to D. His final position (D) is 12 km north (8+4) and 0 km east-west (6 east – 6 west) of the start. The direct distance is simply 12 km north.
Q7. Blood Relations
Pointing to a photograph, a man says, “She is the daughter of my grandfather’s only son.” How is the woman in the photograph related to the man?
- (a) Sister
- (b) Cousin
- (c) Aunt
- (d) Niece
Answer: (a) Sister
Explanation: Break it down. The man’s “grandfather’s only son” must be the man’s father (as he is the only son). “The daughter of my grandfather’s only son” is therefore the daughter of the man’s father. That is the man’s sister.
Q8. Analogies
Doctor is to Hospital as Teacher is to ?
- (a) Student
- (b) School
- (c) Classroom
- (d) Book
Answer: (b) School
Explanation: This tests a workplace relationship. A doctor primarily works in a hospital. Similarly, a teacher primarily works in a school.
Q9. Series Completion (Advanced)
3, 8, 15, 24, ?, 48
- (a) 30
- (b) 35
- (c) 36
- (d) 40
Answer: (b) 35
Explanation: Look at the differences: +5, +7, +9. The differences are increasing by 2. So, the next difference should be +11. 24 + 11 = 35. Verify: 35 to 48 is +13, which continues the pattern of odd-numbered increments.
Q10. Coding-Decoding (Opposite Letters)
In a certain code, ‘MANGO’ is written as ‘NZLMT’. How is ‘APPLE’ written in that code?
- (a) ZKKOV
- (b) ZKKPV
- (c) ZKKO W
- (d) ZKKOW
Answer: (a) ZKKOV
Explanation: This uses the “opposite alphabet” code where A↔Z, B↔Y, C↔X, etc. M (13th) ↔ N (14th)? Wait, let’s check: M should be opposite of N? Actually, A (1st) is opposite Z (26th). So position ‘p’ maps to (27 – p). M is 13, 27-13=14, which is N. Correct. So for APPLE: A→Z, P→K (27-16=11, which is K), P→K, L→O (27-12=15, O), E→V (27-5=22, V). Result: ZKKOV.
Q11. Syllogism
Statements:
1. All forests are green.
2. Some green things are trees.
Conclusions:
I. Some forests are trees.
II. No forest is a tree.
Which conclusion follows?
- (a) Only I
- (b) Only II
- (c) Both I and II
- (d) Neither I nor II
Answer: (d) Neither I nor II
Explanation: This is a classic syllogism trap. The first statement places forests inside the circle of “green things.” The second says the circles of “green things” and “trees” partially overlap. However, the forest circle could be entirely inside the green circle but not touch the tree circle at all, or it could overlap with it. We can’t be sure. Therefore, neither conclusion is definitely true.
Q12. Data Interpretation (Averages)
The table below shows the number of trees planted in four villages over three years.
| Village | 2020 | 2021 | 2022 |
|---|---|---|---|
| A | 120 | 150 | 180 |
| B | 80 | 100 | 130 |
| C | 200 | 210 | 220 |
| D | 50 | 70 | 110 |
What is the average number of trees planted per year across all villages?
- (a) 130
- (b) 135
- (c) 140
- (d) 145
Answer: (b) 135
Explanation: First, find the total trees planted across all villages and years. A: 120+150+180 = 450. B: 80+100+130 = 310. C: 200+210+220 = 630. D: 50+70+110 = 230. Grand Total = 450+310+630+230 = 1620. There are 4 villages × 3 years = 12 data points. Average = Total / Number of data points = 1620 / 12 = 135.
Q13. Logical Puzzle (The Mislabeled Boxes)
There are three boxes labeled “Apples”, “Oranges”, and “Apples & Oranges”. All labels are incorrect. You may pick one fruit from one box. Which box should you pick from to correctly label all boxes?
- (a) Apples
- (b) Oranges
- (c) Apples & Oranges
- (d) Any box
Answer: (c) Apples & Oranges
Explanation: Since every label is wrong, the box labeled “Apples & Oranges” cannot contain a mix. It must contain only apples or only oranges. Let’s say you pick a fruit from this box. If you get an apple, you know this box is actually “Apples.” Now, the box labeled “Oranges” must then be “Apples & Oranges” (because it can’t be just oranges, and “Apples” is already taken). The remaining box, labeled “Apples,” must be “Oranges.” This logic works if you pick an orange from the “Apples & Oranges” box as well. Picking from the other boxes first won’t give you this definitive starting point.
Q14. Pattern Recognition
Which figure comes next?
Sequence: ▢, △, ◯, ▢, △, ◯, ▢, ?
- (a) △
- (b) ◯
- (c) ▢
- (d) ◇
Answer: (a) △
Explanation: The pattern is a repeating cycle of three shapes: Square, Triangle, Circle. The sequence given has 7 shapes: ▢(1), △(2), ◯(3), ▢(4), △(5), ◯(6), ▢(7). The next shape (8th) should be the second element of the cycle, which is the triangle (△).
Q15. Number Series (Multiplication)
5, 10, 20, 40, ?, 160
- (a) 60
- (b) 80
- (c) 100
- (d) 120
Answer: (b) 80
Explanation: This is a simple geometric progression. Each term is multiplied by 2 to get the next. 5 × 2 = 10; 10 × 2 = 20; 20 × 2 = 40; 40 × 2 = 80; 80 × 2 = 160.
Q16. Direction Sense (Return to Start)
Starting from point X, a person walks 3 km east, then 4 km north, then 3 km west, and finally 4 km south. Where is he now relative to X?
- (a) At X
- (b) 3 km east of X
- (c) 4 km north of X
- (d) 6 km west of X
Answer: (a) At X
Explanation: Visualize or draw it. The east and west movements are equal (3 km each), so they cancel out. The north and south movements are equal (4 km each), so they also cancel out. The person has effectively walked the four sides of a rectangle and returned to the starting corner.
Q17. Coding-Decoding (Forward Shift)
If ‘CODE’ is written as ‘FRGH’, what is the code for ‘LOCK’?
- (a) ORFN
- (b) ORFM
- (c) OREG
- (d) OREN
Answer: (a) ORFN
Explanation: Crack the code by comparing CODE and FRGH. C→F is +3, O→R is +3, D→G is +3, E→H
