Jawabanmu

2014-08-18T03:02:07+07:00
60 cm x 2 = 120 cm
40 cm x 2 = 80 cm
20 cm x 2 = 40 cm
V=120x80x40 = 384000 cm kubik = 384 dm kubik = 384 liter


90 per 90+x = 60 per 86 
90 + x = (90 x 86) : 60
90 + x = (3 x 86) : 2 >>>>disederhanakan, dicoret-coret
90 + x = 3 x 43
90 + x = 129
x         = 129-90
          = 39