Respostas

2013-07-14T00:25:48-03:00
30l --- 100%
4,8l --- x

aí se faz a regra de três e fica assim:
480= 30x
x=480÷30
x=16
resposta: 16%
1 5 1
2013-07-14T00:26:48-03:00
Regra de 3
100% >>> 30L
x >>>>>>> 4,8L
30x=480
x=480/30
x= 16%