My 11yr old had this math problem yesterday and got the answer wrong . For the life of me our family cannot figure out how the teacher got her answer. Only 2 students got the answer right. Please help Question-Tom got on an elevator at the middle floor of a building, went up 4 floors, down 3 floors, up 1 floor and down 9 floors, where he left the elevator on the first floor. How many floors are in the building? I'll post the answer of the teacher after a few of you post your answers.