She can drive to see her cousin using the free gas as the amount of gas required for the round trip is less than 100 gallons
Distance to be covered = 1650 miles
Amount of gas = 100 gallons
Miles per gallon of car = 35 miles per gallon
The total distance of the round trip = 1650 × 2 = 3300 miles
The amount of gas needed to cover 3300 miles :
Since, the gallon of gas won is greater than the gas required to cover the round trip distance, then she can drive to see her cousin
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