La section "ANALYSE D'UN MEDICAMENT" comporte 4 questions, dont 2 sous-questions pour la question 3 et 2 sous-questions pour la question 4. Certaines questions incluent des calculs.

The problem states "Advil 20mg/ml (sirop d'ibuprofène)".
The concentration is $\boxed{\text{20 mg/ml}}$.

Concentration $C = 20 \text{ mg/ml}$
Mass of ibuprofen $m = 100 \text{ mg}$

The concentration formula is $C = \frac{m}{V}$, where $V$ is the volume.
Rearranging for $V$:

The volume of syrup containing $100 \text{ mg}$ of ibuprofen is $\boxed{\text{5 ml}}$.