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

### Instruction:
 Jeremy buys 30 watermelons. He eats 3 watermelons per week. Each week he gives 2 to his dad. How many weeks will the watermelons last?


### Response:
 He eats 3 watermelons per week and gives 2 to his dad, so he has 30 - 3 * 2 = <<30-3*2=24>>24 watermelons left after one week.
So, the watermelons will last 24/3 = <<24/3=8>>8 weeks.