Respostas

2014-06-11T12:06:47-03:00
A___180
B___120
C___200
120(D)___480

____________________
A
120___480
A    ___ 180
A= 45
____________________
B
120___480
B    ___120
B=30
_____________________
120___480
C   ___200
C= 50

resposta: 
a = 45 
b = 30 
c = 50