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!
You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?