The hardest question is as follows: x + (y * x) / zy - 28 * x! = ?. The "!" means factorial. It is the hardest question because you do not know the values of x, z and y. In other words it is impossible!
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1+1 ANOTHER ANSWER: Here are some found on the web: http://www.skytopia.com/project/imath/imath.html#13 http://www.geocities.com/CapeCanaveral/lab/4661/ http://rageinthepage.blogspot.com/2007/09/hardest-math-problem-ever.html
3.41 x 1,3019234 divided by 12347 x 8 + your age - 1804351 x 235-135425 squaredx 10 to the fifth power + 1- 1243818723847=
There are many maths puzzles that have not been solved. Any puzzle that has an answer cannot be harder than one that mathematicians still have not solved. So a second hardest puzzle cannot exist. Even amongst puzzles with answers, what you may consider hard may be easy to someone else, and conversely.
The lady who invented maths was called Charlotte Higgleson and she was born in Greece
The difference of maths and geography is maths is more better than geography