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Un professeur donne trois exercices aux élèves ayant eu moins de 10/20 au dernier devoir et deux exercices à ceux ayant eu plus de 10/20. Il distribue au total autant d'exercices aux élèves ayant eu moins de 10 qu'aux élèves ayant eu plus de 10.Combien d'élèves avaient eu plus de la moyenne au dernier devoir ?(1) La classe comporte trois élèves de plus ayant eu plus de la moyenne que d'élèves ayant eu moins de la moyenne.(2) La classe comporte quinze élèves.

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