When is Cheryl's Birthday? Question and answer from Sal Khan of Khan Academy

A TV presenter in Singapore recently referred to a math problem that has been driving the Internet crazy.

The problem may at first seem impossible to solve, but once you use some logic, the solution is actually rather simple.

Try it yourself before listening to Sal’s explanation on the video.

The question was originally thought to be posed to fifth graders but was later clarified to be for 14-year-olds competing in the Singapore and Asean Schools Math Olympiads (SASMO).


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