2015 UNM-PNM Statewide High School Mathematics Contest II Problems/Problem 4
Problem
There are 
coins in a parking meter and we know that one of them is counterfeit. The
counterfeit coin is either heavier or lighter than the others. How can we find the fake coin
and also if it is heavier or lighter in three weighings using a balance scale? Hint: 
.
Solution
See also
| 2015 UNM-PNM Contest II (Problems • Answer Key • Resources) | ||
| Preceded by Problem 3 |
Followed by Problem 5 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 | ||
| All UNM-PNM Problems and Solutions | ||
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