WATCH: ‘30 cows in a field riddle’ boggles Irish Mammy

It’s the riddle that has stumped the Internet over the last few months: "30 cows in a field, 28 chickens .. how many didn’t?"

Now, before you start thinking about it, we recommend you watch this Mammy’s attempt as she shows first hand how frustrating it can get.

BEWARE: It is NSFW.