What does 5(n-6) equals to

Ineed in figuring out this problem.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m