## Task 3 - V10713

For an electrical line of $7 \mathrm{~km}$ in length, $259 \mathrm{~kg}$ of copper wire is required.

How many kilograms of copper wire of the same thickness are required for a line of $22 \mathrm{~km}$ in length?
With direct proportionality, $\frac{259}{7}=\frac{x}{22}$ and $x=814 \mathrm{~kg}$. 814 kg of copper wire are required.