Riddle:
You are sitting at a table eating lunch and there are ten flies on the table. With a quick swat, you are able to kill three flies. How many flies are left on the table?
Answer: You killed three flies which remain on the table. The others flew off when you swatted.
Riddle:
How can you cut a cheese round into 8 pieces with only three cuts?
Answer: First you cut the cylinder lengthwise. With the two pieces stacked end to end, you cut the cheese into quarters with two cuts. The result is three cuts and 8 pieces of cheese. See the image below for three cuts needed to divide a cheese round into eight pieces.