Bonjour,
1)
Mathieu: x billes
Pierre: x-4
Brian : 4x
2)
x+ x-4 +4x = 86
3)
6x = 86 +4
6x = 90
x= 90/6 =15
4)
Mathieu: 15 billes
Pierre : 15 - 4 => 11 billes
Brian: 15*4 => 60 billes
