21. There are 2 different colors of socks in a drawer.
Without being able to see inside the drawer, how many socks must you remove from
the drawer to ensure that you will have a pair that match?

3 socks.....the 1st sock you take could be blue or black, the 2nd sock you take could also be blue or black. This means you may have 1 of each color, but on the 3rd try you must make a pair match with either color.

22. A snail is at the bottom of a well and wants to get out.
He manages to crawl up the wall 3 feet each day, but at night he must rest (
after all that work during the day ) and so he slips back down 2 feet. If
the well is 30 feet deep, How long will it take him to get out?

28 days.....the snail averages 1 foot each day, so after 27 days he has reached 27 feet. On the 28th day he crawls up 3 feet during the day, but since he is now at 30 feet and out of the well he no longer slips back 2 feet.

23. On a shelf in the library, there is a 3 book set of
almanacs labeled volume 1, volume 2 and volume 3. Each book is 2 1/2 inches
thick, the pages being 2 inches thick and each cover is 1/4 inch thick. A
bookworm starts eating it's way from the 1st page of volume 1 and stops
at the last page of volume 3. How far did the bookworm travel?

3 inches.....you must visualize that when the books are on the shelf with the binders facing you that the right side of volume 1 is where page 1 is and the left side of volume 3 is the last page of volume 3. This being the case, the worm only eats through the cover of volume 1 ( 1/4 inch ), all of volume 2 ( 2 1/2 inches ), and only the cover of volume 3 ( 1/4 inch ) for a total of 3 inches.

24. An old friend of the family left $666,666 to 2 fathers
and 2 sons to be split equally. After careful consideration they each happily
received $222,222. Why and how was this possible?

Although it seems there are four people, there are only 3. They encompass 3 generations...a grandfather, his son ( who is also a father), and his son. Thus there are 2 fathers and 2 sons, but only 3 people to split the money.

25. If a snail crawls halfway around a circle then turns
around and crawls halfway back, is it now back where it started?

No, it crawls halfway around the circle, but halfway back is only 1/4 of the return trip ( half of a half ).

26. Is there ever a day of the year that has 25 hours in it?

When returning from Daylight savings time the clocks are turned backward one hour. Of course, this only takes place where daylight savings time is observed.

27. Can you tell what we are: Half of Four of us are Two of
us, Twice Two of us are Six of us, Twice Eight of us are Ten of us, and Twice
Five of us are Eight of us?

The letters that comprise the number words. The word two has 3 letters; therefore doubled it would be 6 letters, the word eight has 5 letters and doubled it would have 10 letters, etc.

28. A man and his son are driving home from a basketball game
when they have a terrible accident. The man is taken to the emergency room for
treatment and the boy is taken straight to the operating table. The
surgeon comes over to the operating table, sees the boy and says," I can't
operate on this patient, he's my son! How can this be?

The surgeon is the boy's mother.

29. What belongs to you, but is mostly used by others?

30. You are attending a party with some friends when one of
them states that there is something in the room that everyone can touch with
either of their hands, but you can only touch it with your left hand. What is
it?