Svp j’ai besoin d’aide pour un problème de maths en anglais:
John and Amelia have a baby daughter, Sonia.
John is 23 kg heavier than Amelia,
who is four times heavier than Sonia.
Their combined weight is 122 kg.
How heavy is each person?
John and Amelia have a baby daughter, Sonia.
John is 23 kg heavier than Amelia,
who is four times heavier than Sonia.
Their combined weight is 122 kg.
How heavy is each person?
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Soit x le poids d'Amélia. John pèse x+23 et Sonia pèse x/4. On a l'équation:
x + x + 23 + x/4 = 122
2x + x/4 = 122-23
8x/4 + x/4 = 99
9x/4 = 99
9x = 4*99
9x = 396
x = 396 / 9
x = 44
Amélia pèse 44 kg; tu peux déduire le poids des 2 autres.