SINGAPORE - The question that baffled the world on Monday - when is Cheryl's birthday?
In a maths question that went viral on Monday, Cheryl was the mysterious girl who was teasing two boys, Albert and Bernard, who wanted to know her birthday. She gave them 10 possible dates, then told Albert the month, and Bernard the day.
With some rather scanty clues, the test-taker is asked to figure out Cheryl's birthday.
Dozens of newspapers and websites around the world - from Malaysia and Britain to Germany and the United States - carried the puzzling maths question that tests one's logical deduction skills.
The UK Metro asked: "Can you solve the mind-boggling maths problem that was set for 14-year-olds?", while popular digital media site Mashable said: "A math problem for 14-year-olds is stumping the world". It was the top-trending story on US site Buzzfeed.
The Mail said: "Of course, perhaps the more important question is whether Cheryl deserves a birthday gift at all after putting us through all of this."
In Malaysia, the Malay Mail carried a lengthy online article that called it a "quirky question" that went viral.
It all started over the weekend, when Singapore TV talk show presenter Kenneth Kong posted the question on Facebook, saying that it was a question for Primary 5 students. The post was shared more than 4,500 times.
It was sent to him by a friend whose Primary 5 niece had asked him for help with an assignment last week.
But it turned out to be a question leaked from a Singapore and Asian Schools Math Olympiad, and is meant for Secondary Three and Four students.
You can get the question and answer here.
Aside from discussing the problem, some netizens had issues with the way the question was phrased and criticised the English used. Humorous comments about Cheryl's coy behaviour also tickled netizens.
There was even a hashtag #cherylsbirthday created on Twitter.