A *cow*culater. I made it up myself, so don't groan at the pun.
On ChinkedIn of course. (I know the pun is racist but I had to share. Sorry.)
Kim Jong Un what you thought it was Slim Jong Un? Sorry but you are not allowed to make puns on your supreme leader's name in North Korea
The cloths hanger only solves one problem.
Someone who solves a problem you didn't know you had in a way you don't understand.
An ironing board.
Sir. Groan worthy penguin jokes(https://allwrong.wordpress.com/2007/10/05/penguin-riddles/)
Math problems actually exist
A math problem.