(all the mentions to FOJ, FOG, GOH, HOJ refer to the angles)
FOJ = 180
FOJ = FOG + GOH + HOJ [make the drawing to see this clearly]
FOG = 2 (HOJ)
GOH = 3 (HOJ)/2
HOJ = HOJ
2 (HOJ) + 3(HOJ)/2 + HOJ = 180
4.5 HOJ = 180
HOJ = 180/4.5
HOJ = 40
FOG = 2(40) = 80
Answer: angle FOG measures 80 degrees.