VIDEO: This riddle was perplexing everyone over the weekend

Especially Irish mammies.

This '30 cows' riddle one of those things that's so deceptively simple that when you finally get it, you'll be kicking yourself.

Like this poor Irish mammy who was driven demented by her husband asking her.

"HOW MANY DIDN'T , WHAT?"

It's easier when you see it written down.

30 cows, 28 chickens… 30 cows, twenty-eight chickens.

Twenty ate chickens.

So the answer is ten.

Cue collective groans.