A Math Problem From Singapore Goes Viral: When Is Cheryl’s Birthday?

A couple of months ago, it was a color-changing dress that blew out the neural circuits of the Internet. Though it may not have quite the mass appeal, this week it is a math problem that is making bushels of brains hurt.

It started with a posting on Facebook, by Kenneth Kong, a television host in Singapore.

From there, people around the world have been trying to figure out Cheryl’s birthday, or at least wondering why she couldn't just save everyone a lot of trouble and be more direct with Albert and Bernard.

The wording of the problem is terrible, so here is a clearer version, which makes some of the assumptions more obvious but which does not change any of the underlying logic of the problem:

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