Under his cell phone plan, Ryan pays a flat cost of $68.50 per month and $5 per gigabyte. He wants to keep his bill at $92.50 per month. How many gigabytes of data can he use while staying within his budget?
Let the number of gigabytes he can use be represented by x.
The cost for x gigabytes of data is 5x.
The total cost, including the flat fee, is 5x + $68.50.
Since Ryan wants to keep his bill at $92.50, we can write:
5x + $68.50 = $92.50
Subtracting $68.50 from both sides, we find:
5x = $24
Dividing both sides by 5, we find:
x = 4.
Ryan can use 4 gigabytes of data and stay within his budget. Answer: \boxed{4}.