Bonjour;
a)
5 kg -> 17€
1kg -> 17/5
3kg -> (3*17)/5
=> 10,20€
b)
20 roses -> 15,60€
1 rose -> 15,60/20
25 roses -> (15,60*25)/20
=> 19,50€
c)
60mn -> 120km
1mn -> 120/60
45mn -> (120*45)/60
=> 90km
d)
3 m -> 10,50
1 m -> 10,50/3
2m -> (10,50 *2)/ 3
=> 7€
il reste la sorcière!
