Applying the Angle Addition Postulate

“Angle XYZ is divided into two adjacent angles, angle XYW and angle WYZ. If the measure of angle XYW is 45 degrees and the measure of angle XYZ is 120 degrees, what is the measure of angle WYZ? Angle ABC is split into two adjacent angles, angle ABD and angle DBC. If the measure of angle ABD is 30 degrees and the measure of angle ABC is 90 degrees, what is the measure of angle DBC?”