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I'm sure some of you may have read this before, but if so, please don't ruin it for everyone else!
See if you can work this out.
"A guy goes to work on the 17th floor of a building Monday to Friday. On some days he gets in the lift at ground floor and goes all the way to the 17th floor. On other days he has to get the lift from ground floor to the 10th floor, where he gets out and takes the stairs for the next 7.
Why does he do this?"
Once again, if you've done it before, please don't answer!
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