You should start your retirement process now then :p~
Since your questions couldn't be completely random, it's just security through obscurity. All I need to do is manually refresh your page a few times and write down all the answers one time.
Since a bot can easily read your image text, it's simple to plug in the answers and have the bot compare text strings and generate the answer.
The main principal behind CAPTCHA is that the text is completely random, so it would be very difficult for someone to generate a hash table or maintain a list of answers. Setting a finite amount of possible solutions actually makes it easier for bots to crack your system.
Granted, noone would spend much effort to crack that type of CAPTCHA on a small site like this, but if it were a piece of widely distributed software or some big site, it would be cracked within minutes.
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