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| Civil Service Exam Numerical Ability |
Civil Service Exam Numerical Ability Reviewer (Part 2)
This is the second part of our Numerical Ability reviewer for the Civil Service Examination (CSE). In this section, we focus on more advanced problem-solving techniques, shortcuts, and commonly repeated question types.
If you already know the basics, this part will help you increase speed and accuracy—critical for passing the exam.
Advanced Topics You Must Master
1. Percentage Increase and Decrease
Formula:
Increase = Original × (1 + Rate)
Decrease = Original × (1 − Rate)
Example:
A salary of 1,000 increases by 20%
👉 New salary = 1,200
2. Profit and Loss
Formulas:
- Profit = Selling Price − Cost Price
- Loss = Cost Price − Selling Price
- Profit % = (Profit / Cost Price) × 100
Example:
Cost = 500, Sold = 600
👉 Profit = 100 (20%)
3. Simple Interest
Formula:
SI = (Principal × Rate × Time) / 100
Example:
P = 1,000, R = 5%, T = 2 years
👉 SI = 100
4. Speed, Distance, and Time
Formula:
Distance = Speed × Time
Shortcut Tip:
If speed doubles, time is cut in half.
5. Work Problems
Formula:
Work = Rate × Time
Tip:
If A can do a job in 5 days, then A’s rate = 1/5 per day.
Powerful Shortcuts for Faster Solving
- 25% = 1/4
- 50% = 1/2
- 75% = 3/4
- 10% = move decimal one place left
Example:
10% of 250 = 25 instantly
Practice Questions (Advanced Level)
1. A product costs 800 and is sold for 1,000. What is the profit percentage?
A. 20%
B. 25%
C. 30%
D. 35%
Answer: B. 25%
2. Find the simple interest: P = 2,000, R = 5%, T = 3 years
A. 200
B. 250
C. 300
D. 350
Answer: C. 300
3. A car travels 120 km in 3 hours. What is its speed?
A. 30 km/h
B. 40 km/h
C. 50 km/h
D. 60 km/h
Answer: B. 40 km/h
4. If a price decreases by 10% from 500, what is the new price?
A. 450
B. 460
C. 470
D. 480
Answer: A. 450
5. If 5 workers finish a job in 10 days, how many days will 10 workers take?
A. 2
B. 5
C. 8
D. 10
Answer: B. 5
Exam Strategy Tips
- Use shortcuts instead of long solutions
- Estimate answers when possible
- Avoid overthinking simple questions
- Practice under time pressure
- Memorize common percentages and fractions
Final Thoughts
Numerical Ability is one of the easiest sections to improve with practice. Mastering shortcuts and advanced problem types will give you a huge advantage during the exam.
Consistency is key—practice daily and track your progress.
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