不要高谈阔伦了,来做做小学题

I have interest on this question. Maths is maths — don’t worry about those common sense. I like this solution though. But at stage 3 (取B瓶一杯倒入A瓶), A bottle will contain 9两 of wine. Is it OK?
A bottle can not contain 9 两 for sure and that is how you know there must be 1 两 remaining in the cup.
 
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