If Two Painters Can Complete Two Rooms Riddle

Can you solve this:

How many painters would it take to paint 18 rooms in 6 hours if two painters can paint two rooms in two hours?

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Here is the answer:

It would take six painters to complete the task. Two painters may paint two rooms in two hours, for a total of four man hours, or two man hours each room.

So two X18 = 36 man hours are required to complete 18 rooms.

For a six-hour painting job, 36 man hours divided by six hours equals six guys working for six hours to paint 18 rooms.