Jawabanmu

Jawaban paling cerdas!
2014-04-16T21:43:00+07:00
Yb = 20, Yd = 160, 140 satuan
Cb = 0, Cd = 100, 100 satuan 
Yx = Cx = Z 
Yx - Yb / Yd - Yb = Cx - Cb / Cd - Cb 
Yx - 20 / 140 = Cx / 100
100(Yx - 20) = 140Cx 
100Z - 2000 = 140 Z
40 Z = -2000
Z = 50