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(4-3) : 3 :4
1 : 3 :4
x18
18 : 54 : 72
Feri = 54 Butir
Seno = 72 Butir
3/1 kali 18=54 [jumlah kelereng feri]
4/1 kali 18=72 [jumlah kelereng feno]
72-54=18