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Jumlah buku Indra = 15
Jumlah buku semuanya = 15 + 20 = 35
Jadi perbandingannya = 15 : 35 = 3 : 7
7.
1/2 = 15/30 (terbesar 2)
1/3 = 10/30 (terbesar 4)
2/5 = 12/30 (terbesar 3)
4/5 = 24/30 (terbesar 1)
Jadi urutannya 4/5, 1/2, 2/5, 1/3
Sekian ^_^