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

### Instruction:
Amanda’s garden contains 20 flowers and Peter’s garden contains three times as many flowers as Amanda's. If Peter gave 15 flowers to his brother, how many flowers are left in his garden?

### Response:
 Idadi ya maua katika bustani ya Peter ni 20 * 3 = <<20*3=60>>60 maua.
Idadi ya maua yaliyobaki baada ya kutoa maua 15 kwa ndugu yake ni 60 - 15 = 45 maua.