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p total kawat = 10 m = 1000 cm
p = 20 cm
l = 17 cm
t = 13 cm
Rusuk balok ada 12 ===> 4 x p , 4 x l , 4 x t
Maka,
(4 x 20) + (4 x 17) + (4 x 13)
80 + 68 + 52
200 <---- (total panjang kawat untuk 1 balok)
Maka,
1.000 : 200 = 5 kerangka balok
Jadi jumlah kerangka balok ada 5
(JAWABAN B)