Question

A lady parks her car on the 6th floor and took a lift up 17 floors to the finance department. She went down 9 floors to the tax department. On which floor is the lady on

Answer 1

Initial position:

$$x(0)=6$$

The finance department is at

$$x(1)=6+17=23$$

Final position:

$$x(2)=23-9=14$$

The lady is on 14th floor.