20 sapi . 9 hari
=
20 - 5 sapi . x hari
= 180 = 15 . x
x = 180 / 15
x = 12 hari
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20 sapi . 9 hari
=
20 - 5 sapi . x hari
= 180 = 15 . x
x = 180 / 15
x = 12 hari