People have been stewing over the correct answer to a coffee-themed puzzle.
A Twitter user shared the logic quiz, in which coffee is poured into a network of pipes leading to four different cups, on Thursday.
You have to figure out which of the cups will receive coffee first:
The brainteaser sparked plenty of debate:
Isn't it 9, 4, 7, 5? (9 first because the distance between the tubes are much shorter than 4.)
— Elite Lucky Gamers ® (@eliteluckygamer) November 10, 2017
Only cup 9 will get coffee....
— Mark Schmidt (@req71338) November 10, 2017
Wouldn't they all get it at the same time
— Pablo Freshcobar🌊🌴 (@wxvybaby) November 9, 2017
— Glenda Prince (@atxsoccermom) November 10, 2017
It's # 9.
— MHodges (@Mayhemsmate) November 10, 2017
— 😈🤷🏽♂️ (@RyoIsMyName) November 9, 2017
4...9....7.....5 in that order
— Rγαη Fυgαζí 🇱🇨 (@HALFyute) November 9, 2017
Some people answered correctly, but many appeared to miss one key point.
Warning: the answer is about to be revealed.
A closer look at the pipes shows that the coffee will actually end up in only one cup ― number 5. That’s because the pathways to the other three cups are all sealed off, as another Twitter user illustrated here:
Bravo to all those who nailed the challenge on their own.
This article originally appeared on HuffPost.