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Time & Work Tricks (Efficiency Method) – Bank Exams
Smart Method • Concept Clarity • Fast Solving
1. Basic Concept
Work is directly related to time and efficiency.
👉 If A completes work in 10 days:
Efficiency of A = 1/10
2. Important Formula
Work = Efficiency × Time
3. Combined Work
If A takes 10 days, B takes 20 days:
A's work = 1/10
B's work = 1/20
👉 Total work = 1/10 + 1/20 = 3/20
👉 Time = 20/3 days ✔
4. LCM Method (Shortcut)
👉 Take LCM of time:
A = 10 days, B = 20 days
LCM = 20 units
A → 2 units/day
B → 1 unit/day
👉 Total = 3 units/day
👉 Time = 20/3 ✔
5. Example
A can do work in 5 days
B can do in 10 days
👉 A = 2 units/day
👉 B = 1 unit/day
👉 Total = 3 units/day
👉 Time = 10/3 days ✔
6. Common Mistakes
- Not using LCM ❌
- Wrong efficiency calculation ❌
- Confusion in addition ❌
7. Topper Tip
Always use LCM method. It is fastest and easiest.
8. Quick Practice
A = 6 days, B = 3 days
👉 LCM = 6
A = 1 unit/day
B = 2 units/day
👉 Total = 3 units/day
👉 Time = 2 days ✔
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