Converting Bordeaux's temperature to Fahrenheit:

$\displaystyle{F}=\frac{{9}}{{5}}\cdot{25}+{32}\usepackage{cmbright}\Huge\$

$\displaystyle{F}=\frac{{225}}{{5}}+{32}={45}+{32}={77}\usepackage{cmbright}\Huge\$

$\displaystyle{{95}}^{\circ}\text{F}-{{77}}^{\circ}\text{F}={{18}}^{\circ}\text{F}\usepackage{cmbright}\Huge\$