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a.
4 (p + l+t) = untuk 1 balok
= 4(20+15+10)
= 4(45)
=180cm
balok dapat dibuat = 1600 / 180
= 8,89 = 8 balok
b. dipakai=8 x180 =1.440 cm
sisa = 1.600 - 1.440 =160cm