Each cow gets sold for an amount that is equal to the total number of cows they had, i.e. price of a cow = number of cows they owned. Guest4, it does not say COW THEY HAD LEFT, instead it says COWS THEY HAD, which I have interpreted as original number of cows and apply it for all cows. To my understanding it simply says if they had 6 cows, then they sold all cows for $6 each.