Sofia entered an elevator. The elevator went up seven floors, then down six floors, and finally up five floors. If Sofia got out on the twentieth floor, then she entered the elevator on floor number
(A) 14
(B) 2
(C) 16
(D) 38
(E) 26
Since Sofia goes up 7 floors, then down 6 floors, and then finally up 5 floors, the net result is that she has gone up $7-6+5=6$ floors. Since she finishes on the $20^{\text {th }}$ floor, she must have started on floor number 14 .