Allison's car holds 15 gallons of gas. on a long trip, she fills the tank completely twice. the first time it costs $2.50 a gallon. if she spends a total of $76.50 on gas, how much did gas cost per gallon for the second tank? a. $2.60 b. $2.50 c. $5.10 d. $2.80

So the first time she fills it up it only costs $37.50 so you subtract $76.50 - $37.50 and it comes out to $39. That leaves $39 that she uses the next time filling up her tank so you divide 39 divided by 15 and your answer should be 2.6. Which means you spend $2.60 on each gallon of gas the second time you fill the gas tank