See also the Dr. Math FAQ: 3D and higher Browse Elementary
Puzzles Stars indicate particularly interesting answers or good
places to begin browsing. Selected answers to frequently posed
puzzles: A hen and a half... Measuring with two containers.
Heads, legs: how many animals? - Change for a Dollar [3/14/1995]
How many different ways can you make change for a dollar? Is
there a - Chessboard Squares [11/7/1994] We discovered that
there are 204 squares on a chessboard and found that you would
add the different squares - 1 + 4 + 9 + 16 + 25 + 36 + 49 + 64.
Our teacher wants to know why it works and if there is a quick
way to get the answer. - How Many People? [06/11/2001] There are
three more people in front of Clancy than in front of Nancy, and
twice as many in front of Mary Ellen as in front of Nancy. The
total people in front of the girls is 11. How many people are in
front of each of the girls? - Multiples of 9 Number Puzzle
[03/23/2003] If you take a two-digit number, add the digits, and
subtract the sum fro