Past exam of the chemistry course of the year 1 of the natural sciences course of the University of Cambridge / 2022 / Paper 1 / 5 / c / ii / Solution

The temperature increase shifts the equilibrium towards cis. The ratio $[\mathrm{trans}]/[\mathrm{cis}]$ decreases from about $2.46$ to $2.31$, so the trans fraction falls from $0.71095$ to $2.31/3.31=0.69789$. Trans remains the more abundant isomer; “favours cis” describes the direction of the change, rather than requiring cis to become the majority.