Lizzy: Tony drives a car that gets 25 miles to the gallon. He drives 50 miles round trip to work 5 days a week. His tank holds 10 gallons. He begins the week with a full tank and when he runs out he fills up at the local gas station for $2 a gallon. How much money does Tony spend on gas in 4 weeks?.
Me: Hmmm, let me think. I think this is the detailed solution:
First, we need to determine how many miles Tony drives in 4 weeks. We do this by performing 50 * 5 = 250 miles per week. Next, we multiply the weekly total by 4 by performing 4 * 250 = 1000 miles in 4 weeks. Now, we need to find out how many times Tony needs to fill up his gas tank. His gas tank holds enough gas to last 25 * 10 = 250 miles. This means in 4 weeks, he needs to fill up his tank 1000 / 250 = 4 times. Since Tony's gas tank holds 10 gallons, this means he needs to pay for 4 * 10 - 40 gallons of gas in a month. Since gas costs $2 a gallon, this means Tony spends 40 * 2 = $80 on gas every month,. Final answer: 80.