33 questions from actual RRB NTPC papers · all shown free · click option to reveal solution
Study the following table showing monthly sales data (in lakhs of rupees) for a retail company over 6 months and answer the questions.
| Month | January | February | March | April | May | June |
|---|---|---|---|---|---|---|
| Sales | 120 | 150 | 180 | 210 | 240 | 300 |
Study the following table showing monthly sales data (in lakhs of rupees) for a retail company over 6 months and answer the questions.
| Month | January | February | March | April | May | June |
|---|---|---|---|---|---|---|
| Sales | 120 | 150 | 180 | 210 | 240 | 300 |
Study the following line graph data and answer the questions. The table below shows the annual sales (in ₹ Lakhs) of two companies — Company A and Company B — over a period of 6 years from 2018 to 2023.
| Year | Company A (₹ Lakhs) | Company B (₹ Lakhs) |
|---|---|---|
| 2018 | 120 | 80 |
| 2019 | 150 | 100 |
| 2020 | 180 | 120 |
| 2021 | 240 | 160 |
| 2022 | 300 | 200 |
| 2023 | 360 | 270 |
Note: All values are in ₹ Lakhs.
Study the following table showing quarterly sales data (in lakhs of rupees) for a manufacturing company over two years and answer the questions.
| Quarter | Q1 2022 | Q2 2022 | Q3 2022 | Q4 2022 | Q1 2023 | Q2 2023 | Q3 2023 | Q4 2023 |
|---|---|---|---|---|---|---|---|---|
| Sales | 120 | 150 | 180 | 240 | 200 | 250 | 300 | 360 |
Study the following table showing quarterly sales data (in lakhs of rupees) for a retail company over 3 years and answer the questions.
| Quarter | 2021 | 2022 | 2023 |
|---|---|---|---|
| Q1 | 120 | 150 | 180 |
| Q2 | 140 | 165 | 210 |
| Q3 | 160 | 180 | 240 |
| Q4 | 200 | 220 | 280 |
Note: All figures are in lakhs of rupees.
Study the following line graph data and answer the questions. The table below shows the annual sales (in ₹ Lakhs) of two companies — Alpha Corp and Beta Ltd — over a period of 6 years (2018 to 2023).
| Year | Alpha Corp (₹ Lakhs) | Beta Ltd (₹ Lakhs) |
|---|---|---|
| 2018 | 120 | 80 |
| 2019 | 150 | 100 |
| 2020 | 180 | 120 |
| 2021 | 240 | 160 |
| 2022 | 300 | 200 |
| 2023 | 360 | 270 |
Note: All values are in ₹ Lakhs.
Study the following table showing quarterly production figures (in thousand units) of an electronics manufacturing company from 2022 to 2024, and answer the questions.
| Quarter | Q1 2022 | Q2 2022 | Q3 2022 | Q4 2022 | Q1 2023 | Q2 2023 | Q3 2023 | Q4 2023 | Q1 2024 | Q2 2024 |
|---|---|---|---|---|---|---|---|---|---|---|
| Production (in thousand units) | 120 | 150 | 180 | 210 | 240 | 270 | 300 | 330 | 360 | 390 |
Study the following table showing quarterly production figures (in thousand units) of an electronics manufacturing company over 3 years and answer the questions.
| Quarter | Year 1 | Year 2 | Year 3 |
|---|---|---|---|
| Q1 | 120 | 156 | 195 |
| Q2 | 140 | 168 | 210 |
| Q3 | 160 | 184 | 228 |
| Q4 | 180 | 200 | 252 |
Note: All figures are in thousand units.
Line graphs are one of the most frequently tested data interpretation questions in SSC CGL. They show how data changes over time using connected points on a coordinate plane. The x-axis typically shows time periods (years, months, days) while the y-axis shows values (sales, population, temperature, etc.). Key Rules for Line Graphs:
1. Each point represents a specific value at a specific time 2. The line connecting points shows the trend between periods
3. Steep upward slope = rapid increase 4. Steep downward slope = rapid decrease
5. Horizontal line = no change 6. Multiple lines can represent different categories for comparison
SSC CGL typically asks 5 questions per line graph. Common question types include: percentage increase/decrease between years, finding averages, comparing values, calculating ratios, and identifying maximum/minimum values. Questions often test your ability to read coordinates accurately and perform quick calculations.
#1 - Quick Percentage Change: For small percentages, use this mental math trick: 10% = 1/10, 20% = 1/5, 25% = 1/4, 33.33% = 1/3, 50% = 1/2. This helps you estimate answers quickly without lengthy calculations.
Identify values - 2020 = 50 lakhs, 2021 = 30 lakhs
Apply formula - [(30-50)/50] × 100
Calculate - [-20/50] × 100 = -40%
Answer - 40% decrease Worked Example 2: From the same graph, find the average sales over three years.
Add all values - 40 + 50 + 30 = 120 lakhs
Divide by number of years - 120 ÷ 3 = 40 lakhs
Answer - Average sales = 40 lakhs Shortcut Trick #2 - Reading Values Quickly: Always check the scale first. If y-axis shows 'in thousands' or 'in lakhs', multiply accordingly. Mark the grid lines mentally to avoid misreading coordinates. Shortcut Trick #3 - Estimation for Speed: For percentage calculations, round numbers to nearest 10 or 5 for quick estimation. Then fine-tune if needed. This saves precious exam time. The #1 Most Common Trap: Students often misread the scale or units on axes. A graph showing 'Sales in thousands' means 5 on the graph = 5,000 actual sales. Always check what the axes represent before solving. This single mistake causes more wrong answers than calculation errors. Another trap is confusing percentage increase with percentage of total - read questions carefully to understand what exactly is being asked.