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3 18,75
3x= 37,5
x= 37,5/3
x= 12,5
panjang kawat yang beratnya 2kg adalah 12,5 m
18,75 m : 3 = 6,25 m
1 kg = 6,25 m
6,25m X 2 = 12,5m
2 kg = 12,5 m