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36 × 8 = 288 mm
Jumlah buku dg tebal 12mm =
288/12 = 24 buah
Cara lain =
8/12 × 36 = 24 buah
Jadi, banyak buku 12mm yang dapat diletakkan di rak buku yaitu 24 buah.
Maaf kalo salah, semoga membantu