Dolly has decided to earn a little extra money over the winter by shoveling snow.ÿ She determines that her total cost of shoveling is $7.50 per driveway regardless of how many driveways she does.ÿ One neighbor is willing to payDolly $15 to shovel.ÿ A second neighbor is willing to pay $10. A third is willing to pay $5 and a fourth is willingto pay $4. How many driveways should she shovel?

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