A certain number of persons can complete a task in 28 days. If there were 150 persons more, it would have taken 7 days less for the task to be completed. How many persons are there in the beginning?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 450.
The original number of persons = x
Work = Persons × Days
Total work = x × 28 = 28x
With 150 more persons, the new number of people = x + 150
They take 21 days = (x + 150 ) × 21 = 28x