Explications étape par étape:
1. 10 pommes=3 poires => 10 pommes = 3*100g => 10 pommes=300g => 1 pommes = 300/10 = 10g
2. 8 bananes = 2 poires => 8 bananes = 2*100g => 8 bananes = 200g => 1 banane = 200/8 = 25g
