The real WTF with this captcha is that to get a new one they recommend you reload the page, which will clear out everything you just typed into the form (since you probably typed that all before getting to the captcha), which is retarded.
If you try to be smart and just put in a known wrong answer in hopes that it'll keep the form data and give you a new question, you get dumped to a validation page which tells you you're wrong and then tells you to go back and reload the page, which is also retarded. You still come out ahead because when you hit the back button you should get a new captcha and the browser should have saved your form data, but man, this page belongs in the UX hall of shame regardless of how you feel about math in your captchas.
If you try to be smart and just put in a known wrong answer in hopes that it'll keep the form data and give you a new question, you get dumped to a validation page which tells you you're wrong and then tells you to go back and reload the page, which is also retarded. You still come out ahead because when you hit the back button you should get a new captcha and the browser should have saved your form data, but man, this page belongs in the UX hall of shame regardless of how you feel about math in your captchas.