Oranges

A man is selling oranges from a wheel barrow

The first customer comes to him and say’s I will have half of what you’ve got plus a half of one

The second customer comes to him and say’s I will have half of what you’ve got plus a half of one

The third customer comes and say’s I’ll have half of what you’ve got left plus a half of one.

Once that customer had left the man had no more oranges left he only sold whole oranges,  he never sold half an orange

How many did he have to start with?