Question 1012986
A=================================E  30
A===========================D 25
================B=================E 15
=======================C
BE is 15 units, BD is 10 units
C is half way between B and D
B is at 15 units from A
D is 25 units from A
C must be at 20 units, half way between 15 and 25.
BC is 5 units.