A Singapore math problem has gone viral, leaving many asking, "When is Cheryl's Birthday?" ABC News' Gio Benitez solves the puzzle in a step-by-step video guide.

@odp101: I bet Cheryl from this logic problem doesn't make friends easily. #cherylsbirthday @integratedmalay: Kimak. Why won't Albert and Bernard just check when exactly is Cheryl's birthday on FB?

Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates. May 15, May 16, May 19 June 17, June 18 July 14, July 16 ...

Cheryl’s birthday challenge was meant to test the better high-school students competing in the Singapore and Asian Schools Math Olympiad, held April 8. Here it is: Cheryl has a birthday, and she ...

Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates. May 15, May 16, May 19 June 17, June 18 July 14, July 16 ...

The former Baltimore journalist Cheryl Lu-Lien Tan is a fashionista who doubtless looks pulled-together even when she’s sick in bed, a woman with a taste for Narciso Rodriguez gowns and Manol… ...

"Then I also know when Cheryl's birthday is," Albert says (smugly, probably). Since he only knows the month, that means it can't be August since there are two remaining dates left in that month.