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

### Instruction:
 唐娜买了马西亚买的三倍多的铅笔。马西亚买的铅笔数量是辛迪的两倍。如果辛迪花了30美元买了0.50美元的铅笔，唐娜和马西亚一共买了多少支铅笔？


### Response:
 辛迪买了30/0.50 = <<30/0.50=60>>60支铅笔。
马西亚买了2*60 = <<2*60=120>>120支铅笔。
唐娜买了3*120 = <<3*120=360>>360支铅笔。
一共，唐娜和马西亚买了120+360 = <<120+360=480>>480支铅笔。