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If 15 person can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?
- A7
- B3.5
- C5
- D7.5
Answer not set
Discussion 1
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CCommunity
Time taken by 15 persons to do a job = 30 days
⇒ Time taken by 1 person to do a job = 30 × 15 = 450 days
⇒ Time taken by 1 person with twice the efficiency = 450/2 = 225 days
⇒ Time taken by 30 persons with twice the efficiency = 225/30 = 7.5 days
∴ Time taken by 30 persons with twice the efficiency = 7.5 days
⇒ Time taken by 1 person to do a job = 30 × 15 = 450 days
⇒ Time taken by 1 person with twice the efficiency = 450/2 = 225 days
⇒ Time taken by 30 persons with twice the efficiency = 225/30 = 7.5 days
∴ Time taken by 30 persons with twice the efficiency = 7.5 days