Answer:
The answer to your question is: 5 bottles
Step-by-step explanation:
Process
First week
Divide 24 by 8
            24/8 = 3 bottles = 1/8
            but Sanjay drank 3/8 = 9 bottles
And there are 24 - 9 bottles left = 15
- Second week
Divide 15 by 3
            15/3 = 5 then 5 bottles = 1/3
            but sanjay drank 2/3 = 10 bottles
Then, there are 15 - 10 bottles left  = 5
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