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There are  cars in the CMC 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?

 Jan 30, 2021
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b + 1/2 b   + .8(b + 1/2b) = 81

b = 30

 Jan 30, 2021

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