Cost of renting a sailboat

The total cost (c) in dollars of renting a sailboat for n days is given by the equation
                              c = 120 + 60n
If the total cost was $360, for how many days was the sailboat rented?

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c = 120 + 60n   {given equation}
360 = 120 + 60n   {substituted the total cost, 360, for c}
240 = 60n   {subtracted 120 from each side}
n = 4   {divided each side by 60}

The sailboat was rented for 4 days.

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