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

### Instruction:
A fifth-grade class went on a field trip to the zoo, and their class of 10 students merged with another class with the same amount of students. 5 parents offered to be a chaperone, and 2 of the teachers from both classes will be there too. When the school day was over, the students could choose to go home and 10 of them left. Two of the chaperones were parents in that group, so they left as well. How many individuals were left at the zoo?

### Response:
 Jumla, kulikuwa na wanafunzi 10*2=<<10*2=20>>20.
Kulikuwa na waongozaji 5, walimu 2, na wanafunzi 20, hivyo jumla ya watu ni 5+2+20= <<5+2+20=27>>27.
Baada ya siku ya shule kumalizika, watu 27-10=<<27-10=17>>17 walibaki.
Baadhi ya waongozaji walifuata mkondo huo, hivyo walibaki 17-2=<<17-2=15>>15 watu kwenye zoo.