A riddle problem is a question or statement intentionally phrased so as to require ingenuity in ascertaining its answer or meaning, typically presented as a game.  Below is a list of the past problem of the week riddles in descending chronological order.

Riddle: How much will a 38° angle measure when looked at under a microscope that magnifies ten times?
Answer: It will still be 38°.
Riddle: What has a foot on each side and one in the middle?
Riddle: If 10 bags of jelly beans and 6 licorice sticks cost \$1, and 10 licorice sticks and 6 jelly bean bags cost 92 cents. How much does one licorice stick cost?
Answer: 5 cents while Jelly bean bags cost 7 cents.
Riddle: A farmer in California owns a beautiful pear tree. He supplies the fruit to a nearby grocery store. The store owner has called the farmer to see how much fruit is available for him to purchase. The farmer knows that the main trunk has 24 branches. Each branch has exactly 12 boughs and each bough has exactly 6 twigs. Since each twig bears one piece of fruit, how many plums will the farmer be able to deliver?
Answer: None. A pear tree does not bear plums.
Riddle: You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer, and a five-minute timer, how can you boil the egg for only two minutes?
Answer: Once the water is boiling, turn the three-minute timer and five-minute timer over. When the three-minute timer runs out, put the egg in the boiling water. When the five-minute timer runs out, two minutes have elapsed and it is time to take the egg out of the water. You don't need the four-minute timer for this riddle.
Riddle: When my father was 31 I was 8. Now he is twice as old as me. How old am I?
Answer: The difference in age is 23 years, so I must be 23 if my father is twice as old as me.