Respostas

2014-02-18T21:15:41-03:00
100°C---------------120x


C------------------------X



0°C--------------------30°x


 \frac{C - 0}{100 - 0 }  =   \frac{X - 30}{120 - 30 }

 \frac{C }{100  }  =   \frac{X - 30}{90 }

X = C

 \frac{X }{100  }  =   \frac{X - 30}{90 }

90X = 100X - 3000

- 10X = - 3000 (-1)

X = 300

Resposta : 300
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