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1 kodi = 20 helai, maka 5 kodi = 5 x 20 = 100
1 lusin = 12 helai, maka 10 lusin = 10 x 12 = 120
maka 5 kodi : 10 lusin = 100/120 = 5/6
1 lusin = 12 buah, maka 10 lusin = 10 x 12 = 120 buah
Jadi, 5 kodi : 10 lusin = 100 : 120 = 5 : 6