On a highway a wreck occurred and caused a 12 mile traffic
jam on one side of the road. The average car is 13.5 feet in
length, the average truck is 20 feet in length, and the
average 18 wheeler tractor trailer is 75 feet in length. 65%
of the traffic jam consists of cars, 20% trucks, and 15% 18
wheeler tractor trailers. The average distance between
vehicles is 2.5 feet. How many cars are in the traffic jam?