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

### Instruction:
Stoney Hollow Middle School is taking a field trip to the zoo. There are 109 fifth graders, 115 sixth graders, and 118 seventh graders. There are 4 teachers and 2 parents from each grade coming along to chaperone on the trip. There are 72 seats on each school bus. How many buses are needed for the field trip?

### Response:
 Wanafunzi 109 wa darasa la tano + 115 wa darasa la sita + 118 wa darasa la saba = <<109+115+118=342>>342 wanafunzi.
Walimu 4 + wazazi 2 = <<4+2=6>>6 watu wazima wanaokwenda kwenye ziara kwa kila darasa.
Madarasa 3 * watu wazima 6/darasa = <<3*6=18>>18 watu wazima jumla wanaokwenda kwenye ziara.
Wanafunzi 342 + watu wazima 18 = <<342+18=360>>360 watu wanaokwenda kwenye ziara.
Idadi ya mabasi yanayohitajika ni watu 360 / viti 72 = <<360/72=5>>5 mabasi.