Just use dimensional analysis to solve problems like this.
(28 mi/gal)*# gal = 1550 mi.
Solve for # gal.
Then $3.543/gal x # gal = $ cost.
I assume that is $/gal. You omitted the unit.
The 13.45 gallon tank is superfluous information.
how to solve problem-car with 13.45 gallon tank gets 28 miles/gallon. If gas costs 3.543/gallon, how much it will cost to travel 1550 miles
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