Your are given two glasses, one containing exactly 50 tablespoons of milk, the other containing exactly 50 tablespoons of water. You take one tablespoon of out of the milk glass and mix it with the water. You then take one tablespoon of the water/milk mixture and mix it into the pure milk to obtain a milk/water mixture. Are you left with more water in the milk/water mixture or more milk in the water/milk mixture?
Four to Five
Make a word ladder starting with FOUR and ending with FIVE. (Every step in a word ladder differs by only one letter from the previous step, but each step must be an English word. You may add a letter, remove a letter, or change a letter, but the words from one step to the next must differ by only one letter.)
A clock face has the same symbol for all twelve hours, and both hands are exactly the same length (there is no second hand, only an hour hand and a minute hand). The clock stands opposite to a mirror. At what time between 6 and 7 o'clock will the time read exactly the same on the clock as in the mirror?
Ravens and Writing Desks
Why is a raven like a writing desk?
Before you answer something very general like "they're all word problems" or "they're all logic puzzles," I'll tell you that the common thread that I have in mind is something very specific. I'll have the answer to the four puzzles and what they have in common in an upcoming post.