I've got ten or more daughters. I've got less than ten daughters. I've got at least one daughter. If only one of these statements is true how many daughters have I got?
Answer
If I have any daughters there will always be two statements which are true. Therefore I have no daughters.
More Math Riddles
Be Gone!
How do you make 'one' disappear?
Add a 'g' to make it 'gone' or an 'n' to make it 'none'!
6 in roman
After teaching his class all about roman numerals (X = 10 IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The only stipulation the teacher made was that the pen could not be lifted from the paper until the line was complete.
Draw an S in front of the IX and it spells SIX. No one said the line had to be straight :)