Question

Jerome got in the elevator on the first floor of his office building. He went up 20 floors to his office. Then, Jerome took the stairwell down 2 floors for a morning meeting. After the morning meeting, he took the elevator down 7 floors for lunch in the cafeteria. Then, Jerome took the stairwell up 5 floors for an afternoon meeting. On which floor was his afternoon meeting?
A.
twenty-first
B.
thirty-fifth
C.
seventh
D.
seventeenth