bonjour
Solène = x
Amélie = x - 3
Xavier = 2 ( x - 3 ) = 2 x - 6
x + x - 3 + 2 x -6 = 107
4 x = 107 + 3 + 6
4 x = 116
x = 29
Solène a 29 ans, Amélie 26 et Xavier 52 ans
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bonjour
Solène = x
Amélie = x - 3
Xavier = 2 ( x - 3 ) = 2 x - 6
x + x - 3 + 2 x -6 = 107
4 x = 107 + 3 + 6
4 x = 116
x = 29
Solène a 29 ans, Amélie 26 et Xavier 52 ans