Final answer:
To find the number of tables that ordered chips and salsa at Pablo's, we can set up a ratio and solve an equation. In this case, 84 tables ordered chips and salsa.
Step-by-step explanation:
In the given scenario, 7 tables of people ordered chips and salsa for every 2 tables that did not.
We need to find the number of tables that ordered chips and salsa.
To solve this problem, we can set up a ratio. Let's assume that the number of tables that ordered chips and salsa is 'x'.
Then, the number of tables that did not order chips and salsa would be '2x/7' according to the given ratio.
Since a total of 108 tables dined at Pablo's last night, we can set up the equation: 'x + 2x/7 = 108'.
Multiplying both sides of the equation by 7 to eliminate the fraction, we get '7x + 2x = 756'.
Combining like terms, we have '9x = 756'.
Dividing both sides by 9, we find that 'x = 84'.
Therefore, 84 tables ordered chips and salsa at Pablo's last night.