...how to code-decode padlock

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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