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

### Instruction:
There are two warehouses. The first warehouse has twice as many boxes as the second warehouse. If the first warehouse has 400 boxes, how many boxes are there in both warehouses combined?

### Response:
 Ghala la kwanza lina sanduku 400.
Ghala la pili lina sanduku 400 / 2 = <<400/2=200>>200.
Jumla ya idadi ya sanduku ni 400 + 200 = <<400+200=600>>600 sanduku.