Prepare for Infosys, TCS, and Accenture aptitude tests with this one-stop LRDI (Logical & Data Interpretation) practice blog. Includes verified questions, answers, and detailed reasoning to help you ace your placement exams.

Table of Contents

  1. Introduction

  2. Logical Reasoning (Series + Family + Arrangement)

  3. Data Interpretation (Pie Chart, Line Graph, Table)

  4. Answer Key & Explanations

  5. Final Preparation Tips

Introduction

If you’re preparing for Infosys, TCS NQT, Capgemini, Accenture, or Wipro, then mastering Logical Reasoning and Data Interpretation (LRDI) is a must.
These sections test your analytical ability, speed, and accuracy — all key skills employers look for.

Here’s a complete LRDI Practice Set compiled from real company placement exams and logical puzzles.

Logical Reasoning Questions (With Answers)

Q1.

Find the next number in the series:
8, 9, 21, 68, 279, ?

Options:
a) 1395
b) 1404
c) 1397
d) 1405

Answer: ✅ b) 1404
Explanation:
Each term = previous term × (position number) + 1
8×1+1=9, 9×2+3=21, 21×3+5=68… continuing pattern → 1404.

Q2.

Select the missing number:
62, 74, 80, 86, 95, ?, 158

Options:

  1. 100

  2. 108

  3. 122

  4. 113

Answer: ✅ 2) 108
Explanation:
The difference pattern = +12, +6, +6, +9, +13, +50 → Missing term = 108.

Q3.

At a party, seven members attended: Sheela, Amruta, Rohit, Rahul, Ajey, Ranveer, and Gauri.
Sheela is the mother-in-law of Amruta, who is the sister-in-law of Rohit.
Rahul is the father of Ajey.
Ajey is the brother of Rohit.
Ranveer is the only brother of Rahul, who is the father-in-law of Gauri.
Gauri was married to Rohit.

Question: How is Sheela related to Ranveer?

Options:
a) Cousin
b) Mother
c) Sister
d) None of the above

Answer: ✅ b) Mother
Explanation:
Sheela is Rahul’s mother → hence, Ranveer’s mother.

Q4.

Pamila is the granddaughter of Akun who is married to Nikita.
Murali is the brother-in-law of Akun who has two daughters but no son.
Rahul is the cousin of Kamal and brother of Pamila.
Uday and Vanmay are the sons-in-law of Nikita.
Vanmay is married to Yamini and they have two daughters and one son.

Question: How is Yamini related to Rahul?

Options:
a) Aunty
b) Mother
c) Sister
d) Daughter

Answer: ✅ a) Aunty
Explanation:
Vanmay (Yamini’s husband) is Pamila’s uncle → Hence, Yamini = Aunty to Rahul.

Family Relation Set (IBPS IT Officer – 2018)

A, B, C, D, E, F, G, and H are members of a family.
There are 3 females and 2 married couples.

  • A is son-in-law of C.

  • B is daughter-in-law of G, who is father of H.

  • D is son of C.

  • C married F, who is grandfather of E.

  • E is niece of H, who is brother of A.

Q5. Who is brother-in-law of D?

a) G
b) C
c) A
d) B

Answer: ✅ c) A

Q6. Who is brother-in-law of B?

a) A
b) H
c) D
d) None

Answer: ✅ a) A

Q7. Who is father of D?

a) E
b) F
c) A
d) H

Answer: ✅ b) F

Arrangement Puzzle – Boxes with Bulbs

There are 5 boxes: A, B, C, D, and E.
Each box contains different numbers of bulbs.

  • Box E contains more bulbs than B.

  • Box A contains more bulbs than D.

  • Box E’s count is even; Box C’s is odd.

  • Box C > E; Box D not minimum.

  • The highest box has 30 bulbs.

Q8. Which box contains maximum bulbs?

a) E
b) D
c) B
d) A

Answer: ✅ d) A

Q9. Possible bulbs in Box E?

a) 23
b) 15
c) 22
d) 19

Answer: ✅ c) 22

Q10. Which box contains the lowest bulbs?

a) C
b) B
c) E
d) A

Answer: ✅ b) B

Data Interpretation – Pie Chart (Lenovo Employees)

Total Employees = 26,000
Distribution: Cricket, Football, Hockey, Table Tennis, Badminton

Q11. Employees who like Badminton + Football together are approx what % of those who like Cricket + Hockey?

a) 77%
b) 87%
c) 82%
d) 85%

Answer: ✅ b) 87%

Q12. Find total employees who like Table Tennis and Football.

a) 9500
b) 9620
c) 9080
d) 9370

Answer: ✅ b) 9620

Q15. If employees increase by 13 7/9%, and sport preference remains same, find football lovers.

a) 4160
b) 4360
c) 4560
d) 4660

Answer: ✅ c) 4560

🎓 Data Interpretation – School Girls Data (IBPS SO)

Q16. Find the central angle of girls in School B.

a) 57.6°
b) 64.8°
c) 72°
d) 79.2°

Answer: ✅ b) 64.8°

Q17. Girls in School D are how many more than in School E?

a) 264
b) 297
c) 330
d) 363

Answer: ✅ b) 297

Q18. Total girls in Schools A and D together:

a) 1364
b) 1386
c) 1408
d) 1430

Answer: ✅ c) 1408

Q19. Ratio of girls to boys in School F = 9:8. Find total students.

a) 561
b) 550
c) 528
d) 539

Answer: ✅ c) 528

Q20. Girls in School C are what % less than in School A?

a) 33⅓%
b) 25%
c) 66⅔%
d) 75%

Answer: ✅ a) 33⅓%

Line Graph – Imports vs Exports

Q21. If imports in 1996 = ₹272 crores, find exports in 1996.

Answer: ✅ ₹320 crores

Q22. If imports in 1998 = ₹250 crores and total exports in 1998–99 = ₹500 crores, find imports in 1999.

Answer: ✅ ₹300 crores

Final Tips for LRDI Preparation

  1. Understand the logic, not just the answer. Most reasoning questions repeat with different numbers.

  2. Practice puzzles and arrangements daily.

  3. Use mental math tricks to save time in DI calculations.

  4. Revise pie charts, line graphs, and tables — these are the most asked question types.

  5. Stay calm during the exam. Logical questions reward clear thinking over speed.