Andy C. answered • 12/20/17

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6 files in 14 hours is 3/7 files per hour for all 9 employees working together.

Assuming all the employees work at the same pace, the speed of each employee

is 3/7 divided by 9 = 3/7 * 1/9 = 1/7 * 1/3 = 1/21.

That is each employee working alone can complete 1 file in 21 hours.

So it will take 3 employees to complete 1 file in 7 hours.

Therefore, it will take 12 employees (4 times as many) to complete 4 files in 7 hours.

Jonny B.

12/20/17