what do you call a duck that steals
A robber ducky
a quacker? maybe
But hey tip..you should try solving the problems in order to get the answers so that you can solve the riddle. IF you go to shcool with just the riddle solved, you will not get full or perhaps any credit for your work, so better off trying to get help for the actual equations that you are having a hard time solving.
Just a though.....=]