Thirty Six vehicles are parked in a parking lot in a single row. After the first car, there is one scooter. After the second car, there are two scooters. After the third car, there are three scooters and so on. Work out the number of scooters in the second half of the rows.

• 15 scooters
  
  The arrangement will be like CS CSS CSSS CSSSS CSSSSS CSSSSSS CSSSSSSS C
  So after dividing the vehicle in to halves of 18 each, second half will contain 15 scooters and 3 cars.
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