Instead of a simple math question, turn it into a round of Jeopardy and require the spambot to know answers to inane trivia like:
Who won the 1969 World Series?
Who was the 15th President of the United States?
What element has an atomic weight of 235 and atomic number of 92?
What is the distance from the earth to the sun?
What is the capitol of New Hampshire?
Who signed the Declaration of Independence for the State of Georgia?
What year did the Corvette first appear?
What year did the U.S. Air Force become a separate military service?
What date did Richard Nixon resign on?
What day was the Presidential general election in 2004?
Who was Gerald Ford's Vice President?
What branch of the military did Ted Williams serve in?
What branch of the military did Jimmy Stuart serve in?
What was Woodrow Wilson's wife's maiden name?
etc..etc..
I think this sort of question would be much harder for the spambot to know the answer... Spambots are pretty dumb..they must be since they keep posting the same thing over and over - apparently they can do simple addition but I'd bet they'd probably lose on Jeopardy.
Doug D.
Orlando, FL