bonsoir
Arthur = x
Jean = x + 28
Jules = 2 x
x + x + 28 + 2 x = 43
4 x = 43 - 28
4 x = 15
x = 15/4 = 3.75
Arthur a 3.75 €, Jean 31.75 € et Jules 7.50 €
Jorge = x
Maxime = x + 5
Vincent = 3 ( x + 5 ) = 3 x + 15
x + x + 5 + 3x + 15 = 66
5 x = 66 - 5 - 15
5 x = 46
x = 46/5 = 9.2
Jorge = 9.20 € , Maxime = 14.20 € et Vincent = 42.60 €