In a three-digit number, the tens digit is equal to the sum of the hundreds and the units digit. the hundreds digit is three more than the units digit. if the digits are reversed, the new number is 11 less than half the original number. find the original number. SOMEONE HELP

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