This math question from an admissions test for an elementary school in Hong Kong is going viral in China.
According to ChinaSmack, it was the second-most-popular post on Chinese microblogging site Sina Weibo on June 5, when it was published.
The question was part of an admissions test for first-graders. They had 20 seconds to answer. Can you solve it?
Stumped? Scroll down for the answer.
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Flip the image upside down, and you'll quickly see the solution. See readers' comments from the post on Sina Weibo translated into English at ChinaSmack.
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