Daily Mail on MSN
'Simple' math tests leaves people racking their brains - can you solve it in 30 seconds?
Get your timer out and see whether you can remember the golden rule from grade school math class.
Daily Mail on MSN
Simple-looking equation proves difficult to solve - can you remember special rule only geniuses can?
This simple-looking equation has left many people debating the correct answer online. Can you solve it?
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