In the ancient city of Atlantis a monument called a Zin Obelisk was built in honour of the goddess Tina.
The structure (a cuboid) took less than two weeks to complete.
Your task is to determine on which day of the week the monument was completed.
You will need a set of information cards to solve the problem.
For the set, you'll need to print off this Word document
or this pdf
Printable NRICH Roadshow
The original version of this problem appeared in "Improving Work Groups: A Practical Manual for Team Building" by Dave Francis & Don Young.