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itik jantan =
90x 3/15 = 18 ekor
itik betina =
90x 12/15 = 72 ekor
15 di dapat dari jumlah perbandingan yaitu 12+3 = 15
pengecekan = 18+72 = 90
kurang lebihnya maaf :) moga manfaat
= 4/7 + 4/9 × 10/7
= 4/7 + 40/63
= 36/63 + 40/63
= 76/63
= 1 13/63
2. Itik Jantan = 3/15 × 90
= 18 ekor
Itik betina = 12/15 × 90
= 72 ekor
3. Skala = 7 cm : 17.500.000 cm
= 1 : 2.500.000