Answer:
Let's call the total number of people who will attend the movie "x". We know that 95% of these people have yet to arrive, which means that only 5% have already arrived.
We can set up an equation to represent this situation:
5% of x = 170
To solve for x, we need to isolate it on one side of the equation. We can do this by dividing both sides of the equation by 5% (or 0.05, which is the decimal equivalent of 5%):
5% of x / 5% = 170 / 5%
Simplifying the left side of the equation gives:
x = 170 / 0.05
Evaluating the right side of the equation gives:
x = 3400
Therefore, there were 3400 tickets sold for the movie.