Apartment-House Mouse

Paula, the apartment-house mouse, is trying to get in shape. She wants to do this by climbing stairs. She starts on the fourth floor, climbs up five stories, down seven, up six, down three, and up four again. What floor is she on now?

Answer

Paula is on the ninth (4 + 5 – 7 + 6 – 3 + 4 = 9) floor.

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