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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?

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? Correct Answer 450

Given:

The certain number of persons can complete the task in 28 days

Calculation:

Let be assume certain number of person is x

⇒ M1D1 = M2D2

⇒ x × 28 = (x + 150) × 21

⇒ x = 450

∴ The required result will be 450.

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