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

### Instruction:
Ian had twenty roses. He gave six roses to his mother,  nine roses to his grandmother, four roses to his sister, and he kept the rest. How many roses did Ian keep?

### Response:
 Idadi ya jumla ya maua ambayo Ian alimpa mama yake na bibi yake ni sita + tisa = <<6+9=15>>15.
Idadi ya jumla ya maua ambayo alimpa mama yake, bibi yake, na dada yake ni 15 + manne = <<15+4=19>>19.
Kwa hiyo, Ian alibaki na maua moja kati ya ishirini - 19 = <<20-19=1>>1.