La quinta parte del doble de la edad de mi padre menos uno, es menos que 17; mientras que la quinta parte del triple de la edad de mi padre aumentado en 2, excede a 25. Indicar la edad de mi padre.

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap