Respostas

2014-03-15T18:27:20-03:00
X- pf / pe- pf = x- pf / pe- pf
X-30/210-30= x-(-10) / 230-(- 10)
Fazendo a conta : x = 150

210 - 150 = 60
Pe-pf = 210- 30 = 180
60/180 = simplifica = 1/3 :)