Question 585373
"went down 7 floors" ---> -7
"up 10 floors" ---> +10
"up two floors ---> +2
"down five floors" --> -5


Add up the figures to get: -7 + 10 + 2 + (-5) = 0



So her net change is 0 floors (ie after all that, she hasn't gone up or down). Therefore, if she ended on the 11th floor, this must mean she started on the 11th floor.

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