\begin{align} \text{Per a calcular el consum cada 100 km hem de} :&\cssId{Step1}{c =\frac{V}{m}}\\[3px] &\cssId{Step2}{V = \frac{M}{\rho} }\\[3px] &\cssId{Step3}{M = c_{m} }\\[3px] &\cssId{Step4}{m = d }\\[3px] &\cssId{Step5}{c = \frac{c_{m}}{\rho *d} *100km }\\[3px] &\cssId{Step6}{c = \frac{2,5}{0,74 *4,655}*100 }\\[3px] &\cssId{Step7}{c = 72,58 L/100km }\\[3px] \end{align}