David’s mom wants to calculate how much it will cost to drive from Los Angeles, CA, to San Francisco, CA. Gas costs $4.00 a gallon, and the gas mileage of their car is 38 miles/gallon. What additional information does David’s mom need to do this calculation?

To calculate fuel cost, first find the gallons needed: distance ÷ 38 miles per gallon. Then multiply the gallons by $4.00 per gallon. The gas price and mileage are given, so David’s mom also needs the distance between Los Angeles and San Francisco; the gas tank size and highway speed limit are not needed.

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