Coins and a Balance Scale
Library Home || Full Table of Contents || Suggest a Link || Library Help
|You have twelve coins and a balance scale. One of the coins does not weigh the same as the other eleven, but you don't know if the odd coin is heavier or lighter than the others. How can you determine, in three weighings, which coin is the odd coin? With three weighings you can actually find the odd coin in a group of thirteen coins. However, you cannot determine whether the odd coin is heavier or lighter.|
|Levels:||Middle School (6-8), High School (9-12)|
© 1994-2014 Drexel University. All rights reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.