bonjour
Caroline + Véronique = 1/3 + 1/5 = 5/15 + 3/15 = 8/15
il reste 7 /15
1 ) Mathieu = 7/15 x 3/4 = 21/60 = 7/ 20
2) 8/15 + 7/20 = 32/60 + 21/60 = 53/60
part de Benoît = 7/60
3 ) Caroline : 1/3 = 20/60
Véronique : 1/5 = 12/60
Mathieu = 21/60
Benoît = 7/60