Διαθέτουμε ένα βαρέλι με κρασί και θέλουμε να δώσουμε σε κάποιον 1 λίτρο. Πως μπορούμε να το μετρήσουμε ακριβώς, χωρίς καθόλου κρασί να πάει χαμένο, αν διαθέτουμε μόνο δύο δοχεία, ένα των 5 λίτρων και ένα των 3 λίτρων;
Γεμίζεις το δοχείο των 3 λίτρων και το αδειάζεις στο δοχείο των 5 λίτρων. Ξαναγεμίζεις το δοχείο των 3 λίτρων και αδειάζεις κρασί στο δοχείο των 5 λίτρων μέχρι αυτό να γεμίσει εντελώς. Το υπόλοιπο στο δοχείο των 3 λίτρων είναι 1 λίτρο ακριβώς.
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Γεμίζεις το δοχείο των 3 λίτρων και το αδειάζεις στο δοχείο των 5 λίτρων. Ξαναγεμίζεις το δοχείο των 3 λίτρων και αδειάζεις κρασί στο δοχείο των 5 λίτρων μέχρι αυτό να γεμίσει εντελώς. Το υπόλοιπο στο δοχείο των 3 λίτρων είναι 1 λίτρο ακριβώς.