Easy-looking math sum divides people - are you a genius who can remember the rule to solve it?

A simple-looking math equation is spinning heads - leaving internet users torn over the right answer.An X ...
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Easy looking equation sees people fight over the answer - can you solve grade school math sum in 30 seconds?

The internet is torn over an elementary-level math equation which left many scratching their heads. The viral math problem has X users stumped - but the answer comes from lessons learned in fifth or ...