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162 = (160b + 168 j) : (b + j)
162 (b + j) = 160b + 168j
162b + 162j = 160b + 168j
162b - 160b = 168j - 162j
2b = 6j
b = 3j
Jantan : Betina = 1 : 3 (B)
18. ~ Rata-rata 20 bebek = 65 telur
Jumlah telur 20 bebek = 20 x 65 telur = 1300 telur
~ Rata-rata 10 bebek = 80 telur
Jumlah telur 10 bebek = 10 x 80 telur = 800 telur
⇒ Rata - rata telur seluruh bebek = (1300 + 800) : jumlah bebek
= 2100 : (20+10)
= 2100 : 30
= 70 (C)