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Ch03 23
1.
Exercice 23
Soit x = nombre de menus enfants à 9 frs 36 − x = nombre de menus adultes à 22 frs 9x + 22(36 − x) = 623 9x + 792 − 22x = 623 −13x = −169 x = 13 Il a servi 13 menus enfants et 36 − 13 = 23 menus adultes.
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