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Mathematics, 17.05.2021 20:00 mvasquez3122p4vahv

Hayden and Andrea collect sea shells. Hayden began a holiday with 405 shells and Andrea began with 25 shells.
Each day of the holiday Hayden found 27 shells and Andrea found 47
shells on the beach. By the end of the holidays they had the same
number of shells in total.
How long was the holiday?

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