Math Problem Statement
en 5 jours, le pirate a déposé 135 pièces d'or dans son coffre. Chaque jour, il a déposé 7 pièces d'or de plus que le jour précédent. Combien de pièces d'or avait-il déposé le premier jour ?
Solution
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Math Problem Analysis
Mathematical Concepts
Arithmetic Progression
Algebra
Formulas
Sum of an Arithmetic Progression: S = n/2 * (2a + (n-1)d)
Theorems
Arithmetic Sequence Sum Formula
Suitable Grade Level
Grades 6-8
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