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blakang=30 kg
50:30
bertumpu pada brlakang
(50/80)x160=100 cm
bertumpu pada depan
(30/80)x160=60 cm
jadi jawabannya 60cm
50+30=80
a.50/80×160
50×2=100cm
b.30/80×160
30×2=60cm
jdi pnjg pikuln depan=60cm