While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:
'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!
How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?