Bored, came up with a question
There is a job that needs to be done by Jia, Yi, and Bing together. That day, Jia went on a business trip, so he left 9 yuan as a fee for doing the work on his behalf. Yi worked on this task in the morning for 4 hours, and Bing worked on it in the afternoon for 5 hours, finally completing the job. The two of them took the 9 yuan to buy beer, which was just enough to buy 9 bottles of beer. So, based on the labor contributed, how many bottles of beer should Bing drink?
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