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= 4(15+9+10)
= 4.34
= 136 cm
136×6= 816 cm ( 6 kerangka balok)
900-816 = 84 cm (sisa 84 cm)
=4×34
=136 cm
9 m =900 cm
900/136=6,61
jadi kerangka balok yang dapat dibuat ada 6