human
Andy is checking to see if all the cars in the parking lot paid for their parking. 75% of the cars have valid tickets, and 1/5th that number have permanent parking passes. If there are 300 cars in the parking lot, how many people tried to park in the lot without paying?
assistant
How many cars have valid tickets? ** First find how many cars have valid tickets: 75% * 300 cars = <<75*.01*300=225>>225 cars
How many cars have parking passes? ** Then find the percentage of cars with parking passes: 75% / 5 = 15%
How many cars have parking passes? ** Then multiply that number by the total number of cars to find the number with parking passes: 15% * 300 cars = <<15*.01*300=45>>45 cars
How many cars are parked illegally? ** Then subtract all the cars with valid forms of parking to find the number parked illegally: 300 cars - 225 cars - 45 cars = <<300-225-45=30>>30 cars
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