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

### Instruction:
The school is organizing a trip to the museum. 4 buses were hired to take the children and teachers to their destination. The second bus has twice the number of people on it as the first bus. The third bus has 6 fewer people than the second bus. The fourth bus has 9 more people than the first bus. If the first bus has 12 people, how many people are going to the museum in total?

### Response:
 Gari la pili lina watu 12 * 2 = <<12*2=24>>24.
Gari la tatu lina watu 24 – 6 = <<24-6=18>>18.
Gari la nne lina watu 12 + 9 = <<12+9=21>>21.
Hivyo, jumla ya watu ni 12 + 24 + 18 + 21 = <<12+24+18+21=75>>75.