Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
There are 10 cars parked in a mall’s parking lot, each with the same number of customers inside. Each customer only makes 1 purchase. If the sports store makes 20 sales and the music store makes 30 sales, how many customers are in each of the cars?

### Response:
 จำนวนการขายทั้งหมดคือ 20 + 30 = <<20+30=50>>50
ถ้าจำนวนลูกค้าเท่ากันในแต่ละรถ แล้วแต่ละรถจะมีลูกค้า 50/10 = <<50/10=5>>5 คน