Réponses

2014-04-30T14:29:58+02:00
X=marie
x + 2 = arthur
3(x + 2) =aghate = 3x +6
3(x + 2) - 2 = paul = 3x - 4
x + x +2 + 3x + 6 + 3x - 4 = 100
8x + 12 = 100
8x = 100-12
8x = 88
x = 88/8
x = 11
marie 11 ans
arthur 13 ans
agathe 39 ans
paul 37 ans
11+13+39+37 =100 ans