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An electric car drives 40 miles, depleting its battery of 10 kWh of energy. It is...

An electric car drives 40 miles, depleting its battery of 10 kWh of energy. It is charged by plugging into an outlet that draws its power from a natural-gas-burning power plant that has an efficiency of 35%. How much primary energy in kWh of natural gas was used to provide the 10 kWh of energy for the car's battery? Provide your answer to 3 significant figures.

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