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

### Instruction:
 Johnny ananunua pakiti 15 za penseli za rangi kwa ajili ya darasa lake. Kila pakiti ina penseli nyekundu, njano, na kijani ndani yake. Anapofika nyumbani, anagundua kuwa pakiti 3 zina penseli nyekundu 2 za ziada ndani. Johnny alinunua penseli nyekundu ngapi?


### Response:
 Johnny anapaswa kuwa na penseli nyekundu 15 * 1 = <<15*1=15>>15.
Pakiti 3 zina penseli nyekundu 2 za ziada, hivyo kuna penseli nyekundu 3 * 2 = <<3*2=6>>6 za ziada.
Johnny ana jumla ya penseli nyekundu 15 + 6 = <<15+6=21>>21.