1.

1). 72). 3.53). 54). 7.5

Answer»

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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