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Average – Easy and High Scoring Topic
Quantitative Aptitude – Average
Average is one of the simplest and most important topics in quantitative aptitude. It is frequently asked in bank exams and helps in solving many real-life and exam-based problems quickly.
---Basic Concept
Average = Total Sum / Number of Items
Example: Average of 10, 20, 30 = (10 + 20 + 30) / 3 = 20
---Important Formulas
- Total Sum = Average × Number of Items
- New Average = (Old Sum ± Change) / New Number
- If one value changes, total sum changes accordingly
Shortcut Tricks
1. Equal Distribution Concept
Average means equal distribution of total quantity.
2. Assumed Average Method
Take a base value to simplify calculations and adjust differences.
3. Change in Average
If average increases by x, total increase = x × number of items
---Practice Questions
Q1. Find average of 5, 10, 15, 20
Answer: 12.5
Q2. Average of 4 numbers is 25. Find total sum
Answer: 100
Q3. Average of 5 numbers is 20. If one number is removed, average becomes 18. Find removed number
Answer: 28
Q4. Average of 10 numbers is 15. If each increases by 2, find new average
Answer: 17
Speed Strategy
- Use direct formula instead of long addition
- Focus on total sum concept
- Use assumed average for large data
- Avoid unnecessary calculations
Practice Task
1. Find average of 12, 18, 24
2. Average of 6 numbers is 30. Find total
3. If average increases by 5 for 4 items, find total increase
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