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60 + 20 ekor = x hari
60 ekor = 12 hari
80 ekor = x hari
80x = 60 * 12
80x = 720
x = 720 / 80
x = 9 hari
60 ekor sapi = 12 hari
80 ekor sapi = ... hari
60 x 12 = 720
720 : 80 = 72 : 8 = 9 hari
Jadi jika Tono membeli 20 ekor sapi lagi, maka persediaan makanan akan cukup untuk 9 hari