Jawabanmu

2014-05-05T20:08:20+07:00
Luas kebun = 2(p+l) = 2(30+20) = 100
100:5: 20
2014-05-05T20:08:25+07:00
Kell = 2(30+20)
= 2(50) = 100

100/5=20