Grade school math problem leaves people dumbfounded: Can you get the correct answer in 30 seconds?

Can you solve the elementary school problem that divided the internet in less than 30 seconds? Test your might in this ...
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This class 12 student mastered a Japanese memory technique, just in time for board exams

Rudransh Chaturvedi applies a Japanese railway method to tackle exam stress. This simple technique enhances memory recall and reduces careless mistakes in board exams.