## Task 3 - 040513

The school garden of a city school has an area of 0.15 ha. The garden is divided into 9 plots, each with an area of $150 \mathrm{~m}^{2}$ or $200 \mathrm{~m}^{2}$.

How many plots of each size are there in the garden?
The area of 0.15 ha is $1500 \mathrm{~m}^{2}$. In the garden, there are 6 plots of $150 \mathrm{~m}^{2}$ each and 3 plots of $200 \mathrm{~m}^{2}$ each. It is $6 \cdot 150 + 3 \cdot 200 = 1500$.

Note: The system of equations $x + y = 9, 150 x + 200 y = 1500$ is usually not solvable in 5th grade. It is likely that the solution should be found by trial and error.