Kate works on Level 12 and parks her car on the lowest level. If she has to travel 16 levels down to get her car, how many underground levels are in the office tower?
To figure out this equation we need to do the problem 16 - 12. 6 - 2 = 4 and 1 - 1 = 0. So, we know that there are 4 underground levels in the office tower.
