No image was attached in the question, it supposed to have an image. I manage to check the image from other source. Below is the answer:
Step 1:
Look at CJD, DJE and EJF. They form a straight angle so will add up to 180°. Two of the measures are given, so you can figure DJE.
Step 2:
Then DJE and HJG are vertical angles (opposite angles formed by intersecting lines). They have the same measure.
