The diagram shows two straight lines crossing, with the angles labelled $67^{\circ}$, $42^{\circ}$ and $a^{\circ}$. The diagram is labelled "NOT TO SCALE".
(main)[2]
Find $a$.
Worked solution & mark scheme
This 2-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Final answer $25$” …