6th Grade Fractions and Proportions: Problem 4

Problem: A cup is filled to the brim with pure lemonade. After Ben drank 1/3 of the lemonade, he poured water into the mixture, causing the cup to be filled to the brim again. He keeps doing this, and stops after the fourth time. What fraction of the original amount of pure lemonade did he drink?

Key: Split entire process into more calculatable sections

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