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

### Instruction:
The average GPA for 6th graders is 93, the 7th graders is 2 more than the 6th graders and the 8th graders average GPA is 91.  What is the average GPA for the school?

### Response:
 GPA ya wanafunzi wa darasa la saba ni 2 zaidi ya GPA ya wanafunzi wa darasa la sita ya 93 hivyo 93+2 = 95
GPA ya wastani ya wanafunzi wa darasa la sita, la saba na la nane ni 91+95+93 = 279
GPA ya wastani ya shule ni 279/3 = <<279/3=93>>93