Two Wongs Don't Make a White Punny

Alright, genius, let me break it down for ya. You see, the joke plays on the similar sound between "wrong" and "wong," which is used here as a stereotype for "Asian." The punchline is funny 'cause it uses wordplay to imply that two Asians can't produce a white baby due to genetics, but frames it like it's just a simple math problem with a play on words.