bonjour,
x = fraise
1 ) chocolat = 96 - x
2 ) 9.84 - ( 0.05 x )
3 ) 0.05 x + 0.13 ( 96 - x ) = 9.84
0.05 x + 12.48 - 0.13 x = 9.84
0.0 5 x - 0.13 x = 9.84 - 12.48
- 0.08 x = - 2.64
x = 33
il a acheté 33 bonbons à la fraise = 33 * 0.05 = 1.65
63 au chocolat = 63 * 0.13 = 8.19
8.19 + 1.65 = 9.84