If 15 persons can do a job in 30 clays, then 30 persons with twice the efficiency can do the same job in how many days?
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
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