bonsoir
je fais une partie
chocolat = x
soda = x + 0.3
jus d'orange = x + 0.5
x + 0.3 + x + 0.5 + 3 x = 4.3
5 x = 4.3 - 0.8
5 x = 3.5
x = 0.7 €
chocolat = 0.7
soda = 1 €
jus d'orange = 1.20 €
prix premier collège = x
prix second collège = x - 2
25 x = 30( x - 2)
25 x = 30 x - 60
25 x - 30 x = - 60
- 5 x = - 12
x = 12
premier collège = 12 € et second = 10 €
continues
