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Meilleure réponse !
2014-04-30T22:20:09+02:00
Bonsoir

Marie = x
Arthur = x +2
Agathe = 3(x +2)
Paul = 3(x +2) -2

x + x+2 +3 x +6 +3x +6 -2 = 100
8x = 100 - 2 - 6 - 6 +2
8x = 88
x = 11
marie a 11ans, arthur 13, agathe 39 et paul 37 = 100