Braingle Lite



Elevator

Category:Trick
Submitted By:smileysteve
Fun:*** (2.25)
Difficulty:* (0.61)



There is a building with thirty stories, with one elevator. On floor twenty-one, four people get on and zero get off. On floor thirteen, six get on and two get off. On floor nine, eight people get on and four get off. How many people would get on and off on floor thirty-one?

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