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RRB NTPC Pie Charts

Study Material — 9 PYQs (2018–2018) · Concept Notes · Shortcuts

RRB NTPC Pie Charts is a frequently tested subtopic — 9 previous year questions from 2018–2018 papers are included below with concept notes, key rules and shortcut tricks.

9 PYQs
2018–2018
24 Practice
MCQs
10 Key Points
to remember
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Previous Year Questions

RRB NTPC Pie Charts — Past Exam Questions

9 questions from actual RRB NTPC papers · all shown free · click option to reveal solution

Exam Q 12018Previous Year Pattern

What is the sales value (in crores) of Apple in Q4 2023?

Exam Q 22018Previous Year Pattern

What is the ratio of Samsung's sales to Realme's sales in Q4 2023?

Exam Q 32018Previous Year Pattern

If Samsung's sales decreased by 20% from Q3 to Q4, what was Samsung's sales value in Q3 2023 (in crores)?

Exam Q 42018Previous Year Pattern

If Apple's sales increased by 25% from Q3 to Q4, what was Apple's sales value in Q3 2023 (in crores)?

Exam Q 52018Previous Year Pattern

The combined production of Machinery and Chemicals is what percentage more than Textiles production?

Exam Q 62018Previous Year Pattern

What is the ratio of Textiles production to Ceramics production?

Exam Q 72018Previous Year Pattern

How many units of Electronics are produced annually?

Exam Q 82018Previous Year Pattern

How many more units of Electronics are produced compared to Ceramics?

Exam Q 92018Previous Year Pattern

If the company increases total production to 60,000 units while maintaining the same percentage distribution, what will be the production of Machinery?

Concept Notes

Pie Charts— Rules & Concept

Core ConceptRead this first — the foundation of the topic

Pie charts are circular diagrams that show how a whole is divided into parts. Think of a pizza cut into slices - each slice represents a portion of the total. In SSC CGL, pie charts appear in 80% of papers, usually with 2-3 questions worth 6-9 marks.

Key RulesCore rules you must know cold

The complete circle equals 360 degrees. Each part is shown as a sector (slice). The angle of each sector is proportional to the data it represents. All sectors together must equal 360 degrees or 100%.

Formula BlockMemorise — at least one formula appears in every paper

Block:

• Central Angle = (Value/Total Value) × 360°
• Percentage = (Value/Total Value) × 100
• Value = (Central Angle/360°) × Total Value
• Ratio Formula: If angle is θ°, then ratio = θ/360
Exam PatternsWhat examiners ask — read before attempting PYQs

SSC asks three main question types. First, direct calculations from given percentages or angles. Second, comparison questions asking 'how much more' or 'what is the ratio'. Third, application problems combining pie charts with other topics like profit-loss or averages. Powerful Shortcut #1 - The 36° Rule: Since 360° = 100%, then 36° = 10%.

This means 18° = 5%, 72° = 20%, 108° = 30%. Memorize these common angle-percentage pairs to solve questions in 10 seconds. Shortcut #2 - Direct Proportion Method: Instead of calculating percentages, use direct ratios. If sector A has 60° and sector B has 120°, then B is exactly double A. No complex calculations needed.

Worked ExampleSolve this step-by-step before moving on
1
Step 1

Marketing angle = 72°

2
Step 2

Using formula: Value = (72°/360°) × 50,000

3
Step 3

= (1/5) × 50,000 = ₹10,000 Alternate Quick Method: 72° = 20% (using 36° rule), so 20% of 50,000 = ₹10,000 Worked Example 2: In a pie chart showing student preferences, Cricket gets 126°, Football gets 90°, Hockey gets 54°. What percentage more students prefer Cricket over Hockey?

1
Step 1

Cricket = 126°, Hockey = 54°

2
Step 2

Difference = 126° - 54° = 72°

3
Step 3

72° = 20% (using shortcut)

4
Step 4

Hockey percentage = 54°/360° = 15%

5
Step 5

Cricket percentage = 126°/360° = 35%

6
Step 6

Cricket is 35% - 15% = 20% more than Hockey Shortcut #3 - The Remainder Trick: When some sectors are given and you need to find the remaining sector, don't calculate each percentage. Simply subtract given angles from 360°. If three sectors are 80°, 120°, and 70°, the fourth sector is 360° - 270° = 90°. Most Common Trap - The Percentage vs Angle Confusion: Students often mix up

When to UseQuickly decide which method to apply in the exam

percentages and when to use angles. Remember: if the question gives percentages, convert to angles by multiplying by 3.6.

If it gives angles, convert to percentages by dividing by 3.6. This single mistake costs students 2-3 marks per paper. Another Critical Error: Students forget that pie charts represent parts of a whole.

You cannot add values from two different pie charts directly unless they have the same total value. Always check if the total values are same before making comparisons. Pro Tip for Complex Questions: When pie charts combine with other topics, first extract the basic values from the pie chart, then apply the second concept.

Don't try to solve everything in one step.

Key Points to Remember

  • Complete pie chart always equals 360° or 100%
  • Formula: Central Angle = (Value/Total) × 360°
  • Quick conversion: 36° = 10%, so 72° = 20%, 108° = 30%
  • Shortcut: Use direct ratios instead of calculating percentages
  • Remainder formula: Missing sector = 360° - sum of given sectors
  • Each sector angle is proportional to the data value it represents
  • Percentage to angle: multiply by 3.6, angle to percentage: divide by 3.6
  • Never directly compare values from different pie charts with different totals
  • For 'how much more' questions, find the difference in percentages or angles
  • Most questions test either direct calculation or comparison between sectors

Exam-Specific Tips

  • A complete circle has exactly 360 degrees
  • 1% of pie chart equals 3.6 degrees
  • Common sector angles: 90° = 25%, 120° = 33.33%, 180° = 50%
  • If a sector shows 15% data, its central angle is 54°
  • Two sectors with angles 40° and 80° are in ratio 1:2
  • Maximum possible sectors in a readable pie chart is typically 8-10
  • Semi-circle in pie chart represents exactly 50% of total data
  • Quarter circle (90°) represents exactly 25% of total data
Practice MCQs

Pie Charts — Practice Questions

24graded MCQs · easy to hard · full solution & trap analysis · showing 20 of 24

All MCQs →
Practice 1easy

What percentage of total sales do Electronics and Clothing together represent?

Practice 2easy

What is the combined sales value (in lakhs) for Sports & Outdoors and Home & Garden categories?

Practice 3easy

What is the sales value (in lakhs) for the Electronics category?

Practice 4easy

What is the ratio of Electronics sales to Clothing sales?

Practice 5easy

What is the sales value (in ₹) for Sports & Outdoors category?

Practice 6easy

By what amount (in ₹) do Electronics sales exceed Home & Kitchen sales?

Practice 7easy

If Books & Media sales increase by 25% next year while total sales remain ₹5,000 lakhs, what will be the new sales value for Books & Media (in lakhs)?

Practice 8easy

What is the sales value (in ₹) for the Electronics category?

Practice 9easy

What is the combined sales value (in ₹) for Clothing and Books & Stationery?

Practice 10medium

If the company wants to increase the total sales to ₹6,000 lakhs in 2024 while maintaining the same percentage distribution, what will be the sales of Electronics category in 2024?

Practice 11medium

What is the ratio of OnePlus sales to Realme sales in Q3 2024?

Practice 12medium

What is the sales value (in crores) of Xiaomi in Q3 2024?

Practice 13medium

What is the ratio of sales of Home & Kitchen to Sports & Outdoors categories?

Practice 14medium

If the sales of Clothing category increased by 25% in 2024, what would be the new sales figure for Clothing?

Practice 15medium

What is the difference between the sales of Electronics and Books & Media categories?

Practice 16medium

The combined sales of Clothing and Books & Media together represent what percentage of total sales?

Practice 17medium

What is the combined sales value of Apple and Samsung in Q3 2024 (in crores)?

Practice 18hard

What is the average price per unit across all brands (weighted by units sold)?

Practice 19hard

If the total market revenue is ₹10,000 crores, what is the total revenue generated by Xiaomi and Vivo combined?

Practice 20hard

The average production of Electronics, Automotive, and Textiles divisions combined is what percentage more than the average production of Chemicals, Pharmaceuticals, and Packaging divisions combined?

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60-Second Revision — Pie Charts

  • Remember: 360° = 100%, so 36° = 10% for quick calculations
  • Formula: Value = (Angle/360°) × Total Value
  • Trap: Never mix percentages with angles - convert first
  • Shortcut: Use direct ratios instead of complex percentage calculations
  • Quick check: All sector angles must add up to exactly 360°
  • For comparisons: Find difference in angles, then convert to percentage if needed
  • Pro tip: Extract pie chart values first, then apply other mathematical concepts
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