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

### Instruction:
In a classroom, there are blue chairs, green chairs, and white chairs. There are 10 blue chairs. The green chairs are 3 times as many as the blue chairs, and there are 13 fewer white chairs than the green and blue chairs combined. How many chairs are there in a classroom?

### Response:
 Kuna viti vya kijani 10 x 3 = <<10*3=30>>30.
Jumla ya viti vya bluu na kijani ni 10 + 30 = <<10+30=40>>40.
Hivyo, kuna viti vya nyeupe 40 - 13 = 27.
Hivyo, kuna jumla ya viti 40 + 27 = <<40+27=67>>67 darasani.