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This simple Math problem is going viral in Japan nowadays. Current research suggests that only 60% of Japanese in their 20s were able to answer this question correctly. On the other hand, in 1980s about 90% of Japanese found the correct answer to this problem. It's shocking to know how today's smart generation can fail in providing the answer to this simple Math question.

Scroll down to know the correct answer of this viral Math problem.

Share and challenge your friends to solve this problem.