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

### Instruction:
Jar A has 28 marbles. Jar B has 12 more marbles than jar A. Jar C has twice as many marbles as jar B. How many marbles are there altogether?

### Response:
 Jar B ina mabulinge 28 + 12 = 40.
Jar C ina mabulinge 2 x 40 = 80.
Hivyo, jumla ya mabulinge ni 28 + 40 + 80 = <<28+40+80=148>>148.