There is a wall with 1000 closed lockers on it. A person walks down the hall opening every other locker. Then the next person opens every 3rd locker. The next opens every fourth locker. The next every fifth locker.

Once this has been done, how many lockers are still closed?

(In reply to by Anthony)

I think you're thinking of
this problem.

(I made the same mistake initially confusing the two)

Posted by levik on 2002-12-07 05:14:26