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rata-rata = (120+210+160+150)/20
rata-rata = 640/20
rata-rata = 32 m
Jawaban: B
30 x 7 = 210
40 x 4 = 160
50 x 3 = 150
120+210+160+150=640
6+7+4+3=32
640 : 32 = 32 m (b)