Dans la famille Bidule, quatre enfants sont nés, avec trois ans d’écart àchaque fois. Quel âge a l’ainé, sachant qu’àeux quatre ils ont un demi-siecle ?

By: USER1682
26 Agustus 2025 mathematiques 5 minutes
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Question

Grade: Education Subject: mathematiques
Dans la famille Bidule, quatre enfants sont nés, avec trois ans d’écart àchaque fois. Quel âge a l’ainé, sachant qu’àeux quatre ils ont un demi-siecle ?
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tu devrais dormir, tu n' es pas raisonnable ...

soit "a" l' âge de l' ainé, alors on a :

a + a - 3 + a - 6 + a - 9 = 5o
                        4 a - 18 = 5o
                               4 a = 68
                                  a = 17 ans

conclusion : les 4 enfants ont 17 ; 14 ; 11 ; et 8 ans !
Answered on 26 Agustus 2025

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