Correct. $\displaystyle{11}\ \text{ feet}+{25}\ \text{ feet}={36}\ \text{ feet}\usepackage{cmbright}\Huge\$ and $\displaystyle{36}\ \text{ feet}\cdot\frac{{{1}\ \text{ yard}}}{{{3}\ \text{ feet}}}={12}\ \text{ yards}\usepackage{cmbright}\Huge\$ .