Puzzley goodness

So for all those math and puzzle geeks out there, here's a site that does a weekly math puzzle.

Some aren't so hard - others I had to do it a couple of times (speaks to my math skills eh?)

Oh, and a quick tip:

Don't attempt them in a bar after a few beers. That increases the difficulty by a lot. I also wouldn't attempt them while at the aforementioned bar while a gaggle of cute servers are sitting with you - makes you look like a bit of a geek.

Not that I need help with that...