Can you figure out this math problem that's sent the Internet into a frenzy?

A woman in England first tweeted out the problem, remarking that it's much too difficult for it's intended audience: second graders.

Since making the rounds on Twitter, the most popular answers have been 46 and 65, though some users haven't gotten those numbers at all:

The "published answer" for the problem is 65, according to a page called Parents Against Primary Testing. Maybe THIS is why they're against testing…