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Each box in the classroom is locked, the padlock has 3 digits. To find the right combination, students have to find the correct answers to 3 questions, which are cyphered in puzzles/codes/riddles - they are printed on one coloured sheet of paper (the same colour as the box). See the decyphered questions for these boxes:
| 1st digit | 2nd digit | 3rd digit | color of the box | code |
France | Have a look at the EU flags and tell how many countries use yellow stripes. | How many even numbers are in the year, when the 1st Erasmus programme was launched? | How many times is the letter “i” used in the EU’s motto? | yellow | 614 |
Slovakia | Have a look at the EU flags and tell how many countries use only three vertical stripes. | Add all the digits of the year when euro banknotes and coins were first introduced in 12 countries. | How many stars on the EU flag are there? Add all the digits. | green | 543 |
Greece | Have a look at the EU flags and tell how many countries use green colour. | How many odd numbers are in the year date of the treaty of Rome? | How many founding countries of the EU were there? | blue | 646 |
Norway | Have a look at the EU flags and tell how many countries use only red and white. | Add the first and the last digit from the year, when the flag of Europe was adopted by the European Union. | How many official languages are there in the EU? Add all the digits. | red | 456 |
exhibition | Have a look at the EU flags and tell how many countries use only red, blue and white. | Add all the digits of the year, when the 28th member (Croatia) joined the EU. | How many members are there in the European Parliament? Add the first and the last digit . | orange | 768 |