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

### Instruction:
Gerald had 20 toy cars. He donated 1/4 of his toy cars to an orphanage. How many toy cars does Gerald have left?

### Response:
 เจอรัลด์ให้รถเล่น 20 x 1/4 = <<20*1/4=5>>5 คัน
ดังนั้น เขาจะเหลือรถเล่น 20 - 5 = <<20-5=15>>15 คัน