Melissa’s family is driving out of state to her grandmother’s house. They know that it takes 20 gallons of gas to get there, and the cost of three gallons of gasoline is $10.50. How much should the family budget to make the one-way trip?

Three gallons cost $10.50, so one gallon costs $10.50 ÷ 3 = $3.50. For 20 gallons, the cost is 20 × $3.50 = $70.00. The family should budget $70.00 for the one-way trip, which is choice C.

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