Try this solution/explanation:
According to the condition it is possible to define the scale factor from DF to BC: 12/3=4. Using this number:
1. AC=5*4=20;
AB=4*4=16;
angle E=90-25=65°.
2. Scale factor from ΔDEF to ΔABC is 4.
3. Scale factor from ΔABC to ΔDEF is 0.25.
