Respostas

2014-03-23T16:47:33-03:00
8 --- 10 --- 7.500
? --- 4  --- 6.000
8 / x = 4 / 10 * 7.500 / 6.000
8 / x = 30.000 / 60.000
8 / x = 1 / 2
x = 16 horas