The answer is 6.
Need the arithmetic? Here is it:
2 guys can paint 2 room in 2 hours.
1 guy can paint 1 room in 2 hours.
1 guy can paint 18 room in 36 hours.
(1*6) guy can paint 18 room in (36/6) hours.
Therefore, 6 guys can paint 18 room in 6 hours.
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