Question 1
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A can finish a job in 10 days and B in 15 days. How long will they take working together?
- A 12.5 days
- B 25 days
- C 5 days
- D 6 days Correct
Correct Answer: Option D
LCM method: job = 30 units
A = 3 units a day, B = 2 units a day
Together = 5 units a day
Days = 30 ÷ 5 = 6
Trap: averaging 10 and 15 gives 12.5.
Answer: 6 days
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