Respuesta :

AE = 2BD   so
4x + 20 = 2(3x + 5)
4x + 20 = 6x + 10
10 = 2x  
x = 5  Amswer

AE = 4(5) + 20  = 40 Answer 

so BD = 1/2 * 40  = 20 Answer