Question 896468: A large school district has 300 school buses. If each school bus is used 3 hours each day, the average speed of the school buses is 15 mi/h, and the fuel economy of the buses is 10 mi/gal. How much does it cost to run these buses in 22 school days if gasoline costs $1.20 a gallon?
answer: $1200 (is what the key says)
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! number of buses = 300
each bus is used 3 hours per day.
average speed of each bus is 15 miles per hour.
each bus travels 3 * 15 = 45 miles per day.
there are 300 buses, so the total number of miles traveled each day is 300 * 45 = 13,500.
each bus gets an average of 10 miles per gallon.
the number of gallons consumed each day is therefore equal to 13,500 / 10 = 1,350.
each gallon costs $1.20.
the total cost each day is therefore equal to 1,350 * $1.20 = $1,620.
they are doing this for 22 days, so the total cost for the 22 days is equal to 22 * $1,620 = $35,640.
if you combine all of these pieces into one formula, you get:
total cost = 300 * 3 * 15 / 10 *1.20 * 22 = $35,640.
i have no idea where the $1200 comes from.
it has to be an error, or you are reading from the wrong section.
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