An English Puzzle:Please give your answer and explanations in English.A farmer buys a horse for $60.He sells it to his neighbor for $70.Then he discovers he could have made more money if he had sold it at a higher price.He borrows $10 from his wife,and buys the horse back for $80.He then sells it to another neighbor for $90.How much money did he make?Of course the money he made doesn’t include the ten dollars borrowed form his wife.The question:How mu

$20

有10刀还得还给他老婆的。
Do remember to return $10 to his wife!

$10
When he first bought the horse,the money he made was-$60
At the first time he sold it to his neighbour,the money he made was -$60+$70=$10
As he borrowed $10 from his wife,at this time he made no money.
He bought it again and the money he made was -$80
Now it's the last time,he sold it for $90 and now the money he made was -$80+$90=$10

enter $10

＄30

The farmer's total cost: 60 + 70 = 130
His total income: 70 + 90 = 160
His profit: 160 - 130 = 30
Deduct $10 he borrowed from his wife: 30 -10 = 20
Answer: He made $20.