Respuestas

2013-09-23T20:16:22+02:00
A= x-5
l= x 
45 = (x-5)+(x)+(x-5)+(x)
45 = x-5+x+x-5+x
45+5+5 = 4x
55 = 4x
55/4 = X 
x=13, 75
a = 13.75-5a= 8.75
Listo..