Question

You get in an elevator and ride down 5 floors. You realize you forgot something, so you stay on the elevator and ride back up 5 floors. Which expression represents the number of floors you are from your original position?

Answer 1

The expression is ' 0 ', as in 'zero'. If it were anything else, then that wouldn't help you go back to where you started and get what you forgot.

Answer 2

y = x - 5 + 5

Explanation:

Let x be the the original position and y be the new position.

After rid down, 5 floors, the expression would be y = x - 5.

After rid back up 5 floors, the expression changed to y = x - 5 + 5.

Hence, the required expression is y = x - 5 + 5 = x.