Google Interview Questions

My brother-in-law once pondered how many ping-pong balls in the Taj Mahal. Well, turns out Google are wondering a smiliar question. My favourite has to be this one:

In a country in which people only want boys, every family continues to have children until they have a boy. If they have a girl, they have another child. If they have a boy, they stop. What is the proportion of boys to girls in the country?

It's a goody! (Oh, and if you want more, have a look here.)