Question

• 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?

Answer 1

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