There's no way to solve for x with the information given!
Instead, take the ratio of your comment's parent divided by the (grandparent + parent), and you get x. I think.
The Marmite equation.
The Marmite equation?
When considering the Marmite yeast extract product, in the UK x is somewhat above 50. In the US, x is well below 50. Similar values of x probably apply to Vegemite between Australia and the US.
I still didn't get it, until I read this: This distinctive taste is reflected in the British company's marketing slogan: "Love it or hate it." (from Marmite wikipedia page)
Maybe someone with enough karma to produce a poll on HN can submit a "Would you hire Zed Shaw?" poll.