Have you heard the riddle going around on Facebook that goes "There's 30 cows in a field...How many didn't"? Do you want to know the answer?

The full riddle goes: There's 30 cows in a field, 20 ate chickens, how many didn't? People are getting confused online because it sounds like 28, instead of 20 ate. That's why you need to listen the videos very carefully.

So if you do the simple math: 30-20= 10