Respostas

2014-07-24T11:50:37-03:00
5x + x = 78
6x = 78
x = 78/6
x = 13

R: 13 motos e 65 carros

2 3 2
2014-07-24T12:11:51-03:00

x = carros                        y = motos

..................................................................................

x + y = 78

x = 5y

..........................................................

5y + y = 78

6y = 78

y = 78/6

y = 13 (motos)

carros = 5 . 13 = 65 carros