Question 3
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A can finish a job in 30 days. After 10 days his efficiency rises by 25%. How many days in all does he take?
- A 26 days Correct
- B 24 days
- C 25 days
- D 28 days
Correct Answer: Option A
10 days → 1/3 done; 2/3 left
New rate = 1.25/30 a day
Time = (2/3) ÷ (1.25/30) = 16 days
Total = 26 days
Answer: 26 days
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