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

### Instruction:
There are 24 students in the class. One-third had their school portraits taken before lunch. After lunch, but before gym class, 10 additional students had their portraits taken. After gym class, how many students have not yet had their picture taken?

### Response:
 Kabla ya chakula cha mchana, wanafunzi 24/3 = <<24/3=8>>8 walipigwa picha.
Kisha 8 + 10 = <<8+10=18>>18 wamepigwa picha kabla ya somo la mazoezi ya viungo.
Hivyo, wanafunzi 24 - 18 = <<24-18=6>>6 bado hawajapigwa picha.