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= 4 x ( 9+7+4)
= 4 x 20
= 80 cm
banyak kerangka balok yang dapat dibuat = 12m : 80 cm
= 1200 : 80
= 15 buah
#semoga bermanfaat :)
4(p+l+t)
4(9+7+4)
4(20)
80
Banyak balok = 1200 / 80
= 15