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\[ 0.3 \times 20 = 6 \, \text{litres} \]
\[ 20 - 6 = 14 \, \text{litres} \]
\[ \text{Nouveau volume d'eau} = 14 + 10 = 24 \, \text{litres} \]
\[ 20 + 10 = 30 \, \text{litres} \]
\[ \left(\frac{6}{30}\right) \times 100 = 20\% \]
\[ 50 + 0.2m \leq 150 \]
\[ 0.2m \leq 100 \]
\[ m \leq \frac{100}{0.2} = 500 \]
\[ A = 1000(1.05)^3 \]
\[ \frac{280}{2} = 140 \, \text{km} \]