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p = 5/10 x 20 = 10cm
l = 3/10 x 20 = 6cm
t = 2/10 x 20 = 4cm
(Maaf jika salah)
Kerangka balok = 80 cm
4( p + l + t) = 80
4(5x + 3x + 2x) = 80
4 . 10x = 80
40x = 80
x = 80 : 40
x = 2
Maka ukuran lebarnya = 3x = 3 . 2 = 6 cm