Respostas

2013-11-24T21:58:50-02:00
720/4= 180
1260/180= 7

R: 7 vagões.
2013-11-24T22:07:18-02:00
4 = 720
-     -
x    1260      

x . 720=  4 .160 =  x=  4 .1260 =  x = 7
                                   720