This math question, from an admissions test for an elementary school in Hong Kong, is going viral in China. The question was part of an admissions test for first graders. They had 20 seconds to answer.
According to this Weibo, what takes an elementary school student just seconds to do; takes a high school student several minutes; takes a college student half and hour and up; and takes a Ph.D a lifetime.
Take a stab at solving this question yourself in 20 seconds.
Hint: The answer is deceptively easy to figure out. You must have the mind of a child.
Can you solve it? If you can, share it with your friends. If you can’t, share this with your friends too to see if they can.