Library of Congress
You have a collection of nine coins. Out of these nine coins, eight are identical in weight, and one is slightly heavier. However, you don't know which coin is the heavier one, and you don't have a scale to weigh the coins. You can use a balance scale only twice to find the heavier coin. How can you determine which coin is heavier using the balance scale only two times?
Answer will be posted Monday in the comments section.
