Miquel and Amelia collect sea shells. Miquel began a holiday with 405 shells and Amelia began with 21 shells.
Each day of the holiday Miquel found 31 shells and Amelia found 55 shells on the beach. By the end of the holidays they had the same number of shells in total.
How long was the holiday?
Topics: Starter  Algebra  Problem Solving  Sequences
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