Jawabanmu

2014-06-10T19:58:18+07:00
20 : 15 : 10
 p  :  l   : t
plt = 3000
2014-06-10T19:58:55+07:00
180 = 4 (4x + 3x + 2x )
180 = 4( 9x )
180 = 36x
x = 5
p= 20 cm
l = 15 cm 
t = 10cm

v = 20 x 15 x 10
  = 3000 cm³

semoga membantu ... maaf kl salah ..