Répondre :
Lucie donne 7/12
il reste 12/12 -7/12 = 5/12
Léa donne 1/4 x 5/12 = 5/48
7/12 + 5/48 = 28/48 + 5/48 = 33/48
ninon donne 48/48 - 33/48 = 15/48
part de lucie = 60 x 28/48 = 35
léa = 60 x 5/48 = 6.25
ninon = 60 x 15/48 = 18.75
35 +6.25 + 18.75 = 60