les nombres 1,7,11,19,30 et un nombre inconnue ont pour moyenne le triple de ce nombre quel est ce nombre ?

By: USER3381
27 Agustus 2025 mathematiques 5 minutes
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Question

Grade: Education Subject: mathematiques
les nombres 1,7,11,19,30 et un nombre inconnue ont pour moyenne le triple de ce nombre quel est ce nombre ?
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Les nombres 1,7,11,19,30 et un nombre inconnu ont pour moyenne le triple de ce nombre quel est ce nombre ?

Soit x le nombre cherché
(1 + 7 + 11 + 19 + 30 + x) / 6 = 3x
68 + x = 3x * 6
68 = 17x
x = 68/17
x = 4
Ce nombre est 4

Answered on 27 Agustus 2025

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