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

### Instruction:
Andrea needs 45 rhinestones to finish an art project. She bought a third of what she needed and found a fifth of what she needed in her supplies. How many rhinestones does she still need?

### Response:
 Andrea alinunua 45 / 3 = <<45/3=15>>15 vito vya kung'aa.
Alipata 45 / 5 = <<45/5=9>>9 vito vya kung'aa katika vifaa vyake.
Bado anahitaji vito vya kung'aa 45 - 15 - 9 = <<45-15-9=21>>21.