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
Supposedly simple math sum leaves people confused - can you solve it in 30 seconds?
Get out your timer and number two pencil to see if your arithmetic skills are still sharp.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results