Question

Starting at the bottom of the fire escape ladder on the outside of her building, Jiang Li climbed 63 steps to a friend’s apartment. She then descended 42 steps to retrieve her cat and then ascended 15 steps, coming to rest outside of her apartment’s window.

On what step is Jiang Li standing?

Answer 1

63-42=21+15=36 step

Answer 2

Thanks

Answer 3

np

Answer 4

Negative numbers are strange in the beginning but without them you can't really understand what subtraction means.