Here is the fourth enigma of the week proposed by the students of the 3rd 10 class of the Mont des Accords college, helped by their teacher Audrey Joseph-Floricourt.
Riddle:
Cédric wants to train for the tour of Saint-Martin by bicycle. The first day he travels 1 meter. On the second day he travels 2 meters. On the third day he travels 4 meters and on the fourth day he travels 8 meters.
After 16 days, he managed to circle the entire island.
After how many days did he manage to cover half of this journey?
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