Respostas

2013-01-11T23:13:45-02:00

b = 2c

a = 2b + c

 

a + b +c  = 120

(2b +c) + 2c +c  = 120

(2.(2c) + c) + 2c + c = 120

 

4c + 2c + 2c  = 120

8c = 120

c = 15

 

b = 2c

b = 2.15

b = 30

 

a = 2b + c 

a  = 2.30 + 15

a =  75

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