Final answer:
Without specific context or information from the text, it is not possible to determine the exact number of days Arjun and Thambi work at the tannery versus on the family land.
Step-by-step explanation:
To determine how many days per week Arjun and Thambi work at the tannery and how many on the family land, you need specific information from either the text you are studying or the context provided around this scenario. Since such details are not provided here, I cannot confidently provide you with the correct answer to your question.
Typically, the schedule of workers can vary depending on the needs of the tannery and the family's agricultural obligations, with possible arrangements such as working a majority of days at one place and fewer at the other, or splitting the week between the two. An example could be 5 days at the tannery and 2 days on the family land or vice versa, depending on their contracts and farming requirements.