Jawabanmu

2014-04-11T10:04:51+07:00
(4.20 + 4.18 + 4.t ) = 200 80 + 72 + 4t = 200 t = 12cm
2014-04-11T10:18:19+07:00
4(20+18+t)=200
4(38+t)=200
152+4t=200
4t=200-152
4t=48
t=48/4
t=12cm