Respostas

2014-05-08T15:24:08-03:00
 levara 3 horas. 

80.x= 60.4
80x= 240
x= 240/ 80
x= 3

1 5 1
2014-05-08T15:28:53-03:00
60   =      4
80           x

4   =80
x      60
x=3hs
1 5 1