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

### Instruction:
Ariana heard the news that a new grocery store had opened up in their town, so she decided to buy some flowers for her house. She bought a bunch of 40 flowers, 2/5 of which were roses, 10 were tulips, and the rest were carnations. How many carnations did she buy?

### Response:
 Kwanza, tafuta idadi ya maua ambayo sio waridi, tulipu, au karafuu: maua 40 - (40 * 2/5 + 10) = <<40-((40*2/5)+10)=12>>12 maua
Kisha, tafuta idadi ya karafuu alizonunua kwa kutoa idadi ya waridi na tulipu kutoka kwa idadi ya maua aliyonunua: maua 40 - (40 * 2/5 + 10) = <<40-((40*2/5)+10)=12>>12 maua