How many gigabytes can he use?

Under his cell phone plan, Gavin pays a flat cost of $62.50 per month and $5 per gigabyte. He wants to keep his bill at $86.50 per month. How many gigabytes of data can he use while staying within his budget?

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g = number of gigabytes

5g + 62.5  ≤ 86.5  {price per gb times number of gb's, plus flat fee, needs to be less than or equal to 86.5}
5g ≤ 24  {subtracted 62.5 from each side}
g ≤ 4.8  {divided each side by 5}

He can use 4.8 gigabytes or under, and stay within his budget.

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