Will Solve Captcha for Money?

I've taken the title straight from Slashdot. Its an interesting post about freelancers willing to crack captcha's for money (an not much!).It makes you wonder if there would ever be a safe solution to form population. I've been thinking about a new solution that would probaby deter a little a longer which would be a mix of captcha's and questions. If the image was a readable question (like 2+2) then put in the answer, else just copy the words.What do you think?