The ratio of two supplementary angles is 7:8
Let 7x and 8x be the two angles.
Supplementary angles mean that the sum of these two angles must be equal to 180°
[tex]7x+8x=180\degree[/tex]Solve the equation for x.
[tex]\begin{gathered} 7x+8x=180\degree \\ 15x=180\degree \\ x=\frac{180\degree}{15} \\ x=12 \end{gathered}[/tex]