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Let's let "h" represent the number of hours Gabriella skied.
Then, her total cost can be represented by the equation:
35 + 15h = 95
To solve for "h", we can start by subtracting 35 from both sides:
15h = 60
Finally, we can divide both sides by 15:
h = 4
Therefore, Gabriella skied for 4 hours.