On a weekend road trip, the Jensen family drove 210 miles on highways, where their car gets 35 miles for each gallon of gas and 54 miles on city streets where their car gets 18 miles for each gallon. How many gallons of gas did they use? Let's think step by step and output the final answer after "####".
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On highways, the Jensen family used 210 miles / 35 miles/gallon = <<210/35=6>>6 gallons of gas.
On city streets, the Jensen family used 54 miles / 18 miles/gallon = <<54/18=3>>3 gallons of gas.
Total, the Jensen family used 6 gallons + 3 gallons = <<6+3=9>>9 gallons of gas.
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On a weekend road trip, the Jensen family drove 210 miles on highways, where their car gets 35 miles for each gallon of gas and 54 miles on city streets where their car gets 18 miles for each gallon. How many gallons of gas did they use?
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