To find out how many reams of paper Landscape Elementary uses each week, you can divide the total number of reams used in 3 weeks by the number of weeks.
Given that they use 14 reams in 3 weeks:
\[ \text{Reams per week} = \frac{14 \text{ reams}}{3 \text{ weeks}} \approx 4.6667 \text{ reams/week} \]
Rounding to the nearest hundredth:
\[ \text{Reams per week} \approx 4.67 \text{ reams/week} \]
So, the final answer is 4.67 reams of paper per week.