To find out how many reams of paper Landscape Elementary uses each week, you can divide the total amount of paper they use in three weeks by the number of weeks.
Given that they use 14 reams of paper every 3 weeks, the calculation is:
\[ \text{Reams per week} = \frac{14 \text{ reams}}{3 \text{ weeks}} \approx 4.66667 \text{ reams/week} \]
Rounding to the nearest hundredth, you get:
\[ \text{Reams per week} \approx 4.67 \text{ reams/week} \]
So, Landscape Elementary uses approximately 4.67 reams of paper each week.