✅ Mathematics Topics & Question Types (RRB Group D) – 100 Questions with Answers

1. Q: 24 ÷ (4 × 2) + 3 = ?
   ✅ Answer: 6
2. Q: What is 20% of 250?
   ✅ Answer: 50
3. Q: If CP = ₹200, SP = ₹250, find the profit percent.
   ✅ Answer: 25%
4. Q: A car covers 180 km in 3 hours. Find its speed.
   ✅ Answer: 60 km/hr
5. Q: A can do a job in 6 days, B in 12 days. Together?
   ✅ Answer: 4 days
6. Q: Simple interest on ₹1000 for 2 years at 5%?
   ✅ Answer: ₹100
7. Q: Ratio of boys to girls is 3:2. Boys = 30. Girls = ?
   ✅ Answer: 20
8. Q: Average of 5, 10, 15, and 20?
   ✅ Answer: 12.5
9. Q: Find LCM of 6 and 8.
   ✅ Answer: 24
10. Q: Area of rectangle: length = 10cm, width = 5cm?
    ✅ Answer: 50 cm²
11. Q: If x + 3 = 8, what is x?
    ✅ Answer: 5

📘 Mathematics Topics & Question Types (RRB Group D)

Below is a comprehensive list of Mathematics topics along with the common question types asked in the RRB Group D exam:

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1. Number System

• Basic operations (addition, subtraction, multiplication, division)
• Place value and face value
• Divisibility rules
• Remainders
• Types of numbers (Prime, Composite, Even, Odd, etc.)

2. HCF & LCM

• HCF and LCM of two or more numbers
• Word problems involving HCF & LCM
• HCF/LCM using prime factorization

3. Simplification

• BODMAS rule
• Fractions & decimals
• Square roots & cube roots
• Surds and indices

4. Ratio and Proportion

• Simple & compound ratios
• Direct and inverse proportion
• Word problems

5. Percentages

• Conversion between fractions and percentages
• Profit and loss
• Discount
• Simple interest based on percentages

6. Time & Work

• Work done = Efficiency × Time
• Work and wages
• Pipes and cisterns

7. Time, Speed & Distance

• Speed = Distance / Time
• Relative speed
• Trains, boats & streams problems

8. Simple & Compound Interest

• SI = (P × R × T) / 100
• CI formulas and compoundings
• Difference between SI and CI

9. Algebra

• Linear equations in one variable
• Simple factorization
• Algebraic identities

10. Geometry & Mensuration

• Perimeter and area of basic shapes (square, rectangle, triangle, circle)
• Volume and surface area of 3D figures (cube, cuboid, cylinder, cone, sphere)

11. Data Interpretation

• Bar graphs
• Pie charts
• Tables and line graphs
• Questions based on interpretation of given data

12. Averages

• Average of numbers
• Weighted average
• Word problems

13. Profit, Loss & Discount

• Profit % and Loss %
• Marked price, cost price, selling price
• Successive discounts

14. Age Problems

• Present, past, and future age
• Age ratio-based questions
• Age difference/relationship problems

15. Statistics

• Mean, Median, Mode
• Frequency distribution basics

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