You will be given a definition of a task first, then some input of the task.
You are given a math word problem and you are supposed to apply division mathematical operator on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Context: They decided to hold the party in their backyard. They have some sets of tables, each having the 3 chairs. If there are a total of 9 chairs in the backyard 

 Question: How many sets of tables do they have?
Output:
3