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jantan : betina = 3 banding 12
3+12 = 15
90 : 15 = 6
jantan = 3(6) = 18
betina = 12(6) = 72
15x = 90
x = 90:15
x =6
jadi itik jantan pak jupri sebanyak 3x = 3. 6
= 18