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1 lusin = 12 buah
13 kodi = 20 × 13 = 260 buah
20 buah = 12 × 20 = 240 buah
Jadi,
260 - 240 = 20buah
1 lusin = 12 buah. 20 lusin = 20 x 12 = 240 buah
yang belum terjual = 13 kodi - 20 lusin = 260 buah - 240 buah = 20 buah / 1 kodi
semoga membantu, tolong jadikan jawaban terbaik