panjang : (3x+2)
lebar : x+5
tinggi : 2x-4
jumlah rusuk : 156
jadi..
156=4x(3x+2+x+5+2x-4)
156=4x(6x+2)
156=24x+12
24x=156-12
x=6cm
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panjang : (3x+2)
lebar : x+5
tinggi : 2x-4
jumlah rusuk : 156
jadi..
156=4x(3x+2+x+5+2x-4)
156=4x(6x+2)
156=24x+12
24x=156-12
x=6cm
{4(3x + 2) + 4 (x + 5) + 4(2x - 4)} = 156
12x + 8 + 4x + 20 + 8x - 16 = 156
24x + 12 = 156
24x = 144
x = 6
p = 3(6) + 2 = 20 cm
l = 6 + 5 = 11 cm
t = 2(6) - 4 = 8 cm
Volume
= p x l x t
= 20 x 11 x 8
= 1.760 cm³