Catestby ran up 16 flights of stairs. write an integer to represent this solution?

I'm assuming you mean to write a system to find the amount of steps she took. that would mean there are usually 13 steps in a flight, so the equation would be 16 times 13 to find out the amount of steps taken, which is 208 stairs. If that is not the answer then i don't know what you were looking for. Question is not clear.