There are 81 cars in a parking lot, which are all Acuras, Beetles, or Camrys. There are half as many Acuras as Beetles. The number of Camrys is 80% of the number of Acuras and Beetles together. How many of the 81 cars are Beetles?
+36916 b
a = 1/2 b
c = .8 ( 1/2 b + b) summed = 81
b + 1/2 b + .8 (1/2b + b) = 81 solve for b
