(FOX 5)- A fourth grade girl's answer to a math problem has quickly gone viral thanks to a little thing called "girl code."

What exactly is girl code? According to Urban Dictionary, it is a code of guidelines that *most* girls obey to not get kicked out of the community. For example, don't date your friend's ex-boyfriend...

Facebook user Jenn Morrison Douglas shared a photo of her daughter's math problem last week. The problem asked the following question:

"In high school, Frank, Mike, George, and Ron each went out on a total of 4 dates with 4 different girls. The second time Frank dated Rose and George dated Kay. The third time Mike dated Mary and Ron dated Louise. The fourth time, George dated Louise and Ron dated Kay. For each of the 4 times, tell which girl dated which boy.

Hint: For the fourth date Louise dated George and Kay dated Ron. You know Frank dated Rose on the second date, who had to be Frank's fourth date?"

The little girl answered the math problem by saying she couldn't answer because her mom says according to girl code, you shouldn't date a friend's ex-boyfriend.