One night a certain hotel rented 2/5 of its rooms, including 2/3 of their air conditioned rooms. If 3/5 of its rooms were air conditioned, what percent of the rooms that were not rented were air conditioned?
Choose the correct choice from the following options.
A) 20% B) 25% C) 33% D) 36% E) 40%
The rooms which were not rented is 3/5   The A33% rooms which were not rented is (1/3)*(3/5) = 1/5   The percentage of unrented rooms which were A33% rooms is (1/5) / (3/5) = 1/3 = 33%   The answer is 33%.
<result>C</result>
One night a certain hotel rented 2/5 of its rooms, including 2/3 of their air conditioned rooms. If 3/5 of its rooms were air conditioned, what percent of the rooms that were not rented were air conditioned?