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