Data Interpretation Solved Sets 2026 (6 Sets, 40+ Questions Solved)

Last Updated: June 2026

This page collects six complete data interpretation sets at placement-exam difficulty, spanning tables, bar data, pie shares, line trends, and caselets, with 40+ fully worked solutions. Candidates report DI as a recurring quantitative component in TCS, Infosys, and Wipro rounds, and one where reading the right number fast decides the marks.

Set 1: Sales Table

A company's product sales (units) over four quarters.

Q1. Total sales of A across all quarters? Solution: 200 + 250 + 300 + 250 = 1000.

Q2. Which product had the highest Q4 sales? Solution: A 250, B 300, C 250. Highest is B.

Q3. Average quarterly sales of B? Solution: (150 + 200 + 250 + 300)/4 = 900/4 = 225.

Q4. Percentage increase in B from Q1 to Q4? Solution: (300 - 150)/150 × 100 = 100%.

Q5. Ratio of A's total to C's total? Solution: A = 1000, C = 1000, ratio 1:1.

Set 2: Revenue Bar Data

Annual revenue (in lakh rupees) over five years.

Q6. Total revenue over five years? Solution: 80 + 100 + 120 + 150 + 180 = 630.

Q7. Average annual revenue? Solution: 630/5 = 126.

Q8. Percentage growth from 2021 to 2025? Solution: (180 - 80)/80 × 100 = 125%.

Q9. In which year was absolute growth highest? Solution: Jumps 20, 20, 30, 30. Highest is 2024 or 2025 at 30; the first occurrence is 2024.

Q10. Revenue in 2023 is what fraction of 2025? Solution: 120/180 = 2/3.

Set 3: Budget Pie Share

Monthly budget of ₹60000 split: Rent 25%, Food 30%, Savings 20%, Transport 10%, Others 15%.

Q11. Amount on Rent? Solution: 25% of 60000 = 15000.

Q12. Amount on Food? Solution: 30% of 60000 = 18000.

Q13. Combined Savings and Transport? Solution: 30% of 60000 = 18000.

Q14. Ratio of Food to Savings? Solution: 30:20 = 3:2.

Q15. If budget rises to ₹80000 with same percentages, amount on Others? Solution: 15% of 80000 = 12000.

Set 4: Line Trend

Website visitors (in thousands) per month.

Q16. Total visitors over five months? Solution: 40 + 50 + 45 + 60 + 75 = 270 thousand.

Q17. Which month saw a decline from the previous? Solution: March dropped from 50 to 45.

Q18. Percentage rise from April to May? Solution: (75 - 60)/60 × 100 = 25%.

Q19. Average monthly visitors? Solution: 270/5 = 54 thousand.

Q20. Ratio of January to May visitors? Solution: 40:75 = 8:15.

Set 5: Caselet DI

In a class of 240 students, 40% study Science, 35% study Commerce, and the rest study Arts. Among Science students, 25% are girls.

Q21. How many study Science? Solution: 40% of 240 = 96.

Q22. How many study Arts? Solution: 100 - 40 - 35 = 25%, so 25% of 240 = 60.

Q23. How many study Commerce? Solution: 35% of 240 = 84.

Q24. How many Science students are girls? Solution: 25% of 96 = 24.

Q25. Ratio of Science to Commerce students? Solution: 96:84 = 8:7.

Set 6: Comparative Table

Marks of three students in four subjects (out of 100).

Q26. Raj's total marks? Solution: 80 + 70 + 60 + 90 = 300.

Q27. Who scored highest in Science? Solution: Raj 70, Sana 85, Vik 60. Highest is Sana.

Q28. Average marks of Vik? Solution: (90 + 60 + 80 + 70)/4 = 300/4 = 75.

Q29. What percentage did Sana score overall (out of 400)? Solution: Total = 70 + 85 + 75 + 60 = 290, percentage = 290/400 × 100 = 72.5%.

Q30. In which subject is the gap between highest and lowest the largest? Solution: Maths 90-70 = 20, Science 85-60 = 25, English 80-60 = 20, History 90-60 = 30. Largest is History.

Extra Practice (Q31-Q42)

Using Set 1 sales table.

Q31. Total sales in Q3 across all products? Solution: 300 + 250 + 200 = 750.

Q32. Which quarter had the highest total across all products? Solution: Q1 650, Q2 700, Q3 750, Q4 800. Highest is Q4.

Q33. Percentage of total Q4 sales contributed by B? Solution: B in Q4 = 300, total Q4 = 800, 300/800 × 100 = 37.5%.

Using Set 2 revenue data.

Q34. What would 2026 revenue be if it grows 20% over 2025? Solution: 180 × 1.2 = 216.

Q35. Percentage growth from 2022 to 2023? Solution: (120 - 100)/100 × 100 = 20%.

Using Set 3 budget data.

Q36. How much more is spent on Food than Transport? Solution: Food 18000, Transport 6000, difference 12000.

Q37. Savings as a fraction of total budget? Solution: 20% = 1/5.

Using Set 4 visitor data.

Q38. Total decline in the only month that fell? Solution: March fell by 5 thousand (50 to 45).

Q39. Percentage rise from January to February? Solution: (50 - 40)/40 × 100 = 25%.

Using Set 6 marks data.

Q40. Who has the highest overall total? Solution: Raj 300, Sana 290, Vik 300. Raj and Vik tie at 300.

Q41. Average English marks across the three students? Solution: (60 + 75 + 80)/3 = 215/3 = 71.67.

Q42. Raj's percentage in Maths and History combined (out of 200)? Solution: (80 + 90)/200 × 100 = 85%.

How To Attack Each DI Format

Each DI format rewards a slightly different reading strategy, and knowing the right one for the chart in front of you saves time.

For table DI, the discipline is to read only the row and column the question names, ignoring the rest of the grid. Most table questions need one or two cells, so scanning the whole table is wasted effort. For bar and column data, the values are usually clean round numbers, so totals and averages are quick; the trap is misreading the axis scale, so confirm the units before computing. For pie and percentage-share data, almost every question is a single multiplication of a share percentage by the total, and combined-share questions just add the percentages first. For line trends, the questions usually ask about the direction and size of change between two points, so focus on consecutive differences and percentage changes rather than the absolute values. For caselet DI, where the data is buried in a paragraph, the first move is to extract the numbers into a small table of your own before answering anything, since the paragraph format is designed to slow you down.

The Approximation Mindset

The biggest time saver across every DI format is approximation. Placement DI options are usually spread far apart, so an approximate answer identifies the correct option without exact calculation. Round each number to a convenient value, compute the rough result, and eliminate options by magnitude. Only when two options sit close together do you need exact arithmetic. Candidates report that the instinct to compute everything precisely is the main reason students run out of time in DI; the faster solvers approximate first and refine only when forced to. This mindset, combined with strong fraction-to-percentage recall, is what turns DI from a time sink into a reliable scoring section.

Key Takeaways

Candidates report that DI speed is built on percentage and ratio fluency plus the discipline of reading the question before the data. Internalize the fraction-to-percentage conversions and most DI sets become a quick exercise in finding the right cell and dividing.

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Frequently Asked Questions

What is the fastest way to solve data interpretation sets?

Read the question before the data set so you know exactly which numbers you need, then approximate and eliminate options by magnitude. Compute exactly only when two options are close. Candidates report that percentage and ratio fluency is the underlying skill, since DI is mostly arithmetic under time pressure.

Which DI formats appear most in placement tests?

Candidates report table DI, bar data, and pie shares as the most common formats, with line trends and caselet DI appearing in some companies. This page covers all five so your practice matches the real spread you will face in TCS, Infosys, and Wipro DI sections.

Are calculators allowed in DI sections?

Most placement aptitude tests do not allow calculators, so DI rewards mental approximation. Candidates report that practicing fraction-to-percentage conversions and quick ratio cancellation is what makes the difference, since you must compute these in your head under time pressure.