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If you can travel miles on gallons of gasoline, how far can you travel on gallons? How many miles on gallons? A diagram may help you with your reasoning. Show your work and explain your thinking.  

Since each gallon of gasoline gives the same amount of mileage, use a common ratio for the miles per gallon. 2 column chart: labeled as follows: Row 1, miles and gallons, Row 2: 156 and 4, Row 3: question mark and 12.

The ratio between and gallons is so this ratio also translates to the mileage. Added to the chart, between the second and third rows, in both columns, a change of 3.

miles. Use this same strategy to figure out the mileage for gallons. Added to the chart, Row 3, first column, 468.