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

### Instruction:
 玛西可以从一棵树苗做出3支长矛，从一根原木做出9支长矛。她可以从6棵树苗和一根原木做出多少支长矛？


### Response:
 首先找出她从树苗做出的总长矛数：3支长矛/树苗 * 6棵树苗 = <<3*6=18>>18支长矛
然后加上她从原木做出的数量：18支长矛 + 9支长矛 = <<18+9=27>>27支长矛