Mandy works construction. She knows that a $5$ meter long metal bar has a mass of $40 \text{ kg}$. Mandy wants to figure out the mass $(w)$ of a bar made out of the same metal that is $3$ meters long and the same thickness.
**Which proportion could Mandy use to model this situation?**
[[☃ radio 1]]
**Solve the proportion to determine the mass of the shorter bar.**
[[☃ math-keypad 1]] $\text{kg}$