In one classroom, exactly one-half of the seats are occupied. in another classroom with double the seating capacity of the first, exactly three-quarters of the seats are occupied. if the students from both rooms are transferred to a third, empty classroom that has a seating capacitu exactly equal to the first two combined, what fraction of the seats in the third classroom is occupied?
(a) 1/4 (b) 1/3 (c) 3/4 (d) 2/3 (e) 3/4