• Teresa took a 620-mile trip. She used 20 gallons of gasoline and paid $1.43 per gallon. What was the cost per mile for gasoline?
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1 Answer

620 miles / 20 gallons = 31 miles/gallon

($1.43 / gallon) / (31 miles / gallon) = ($1.43 / gallon) * (1 gallon / 31 miles)

($1.43 / gallon) * (1 gallon / 31 miles) = $1.43 / 31 miles

$0.046 / mile   <<<<<  This is rounded down, so the next operation won't be exact

620 miles * ($0.046 / mile) = $28.52
($1.43 / gal) * 20 gal = $28.60

by Level 11 User (78.4k points)

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