Any 12 from 15 in any order = 15 x 14 x 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 = 217,945,728,000 different ways!
This seems ridiculously high but...
The first space can be any one of fifteen, the second, any one of fourteen and so on until the twelfth can be any one of the remaining four.
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The first car can go in one of 6 spaces, the second in one of the remaining 5, etc. So the total number of ways is 6*5*4*3*2*1 = 720
Simplifying ratio 12:21 gives you 4:7
7 of them !
Different cars have tanks with different capacities.
Average = 300 sqft of total space per car (including aisles etc) So 36260/300 = 120.