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

### Instruction:
 一周内，杰克能吃3个木瓜，他的兄弟能吃5个木瓜，他的父亲能吃4个木瓜。为了满足4周的需求，杰克需要从农贸市场购买多少个木瓜？


### Response:
 一周内，这3个人能吃3 + 5 + 4 = <<3+5+4=12>>12个木瓜。
4周的需求量是12 x 4 = <<12*4=48>>48个木瓜。