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

### Instruction:
Eden, Mary and Iris gather sand to fill their sandbox. Eden carried 4 buckets of sand. Mary carried 3 more buckets of sand than Eden. Iris carried 1 less bucket of sand than Mary. If each bucket contains 2 pounds of sand, how many pounds of sand did they collect in total?

### Response:
 Eden alibeba ndoo 4 za mchanga.
Mary alibeba ndoo 4+3 = <<4+3=7>>7 za mchanga.
Iris alibeba ndoo 7-1 = <<7-1=6>>6 za mchanga.
Kila ndoo ina kilo 2 za mchanga.
Jumla ya kilo za mchanga walizokusanya ni 4*2+7*2+6*2 = <<4*2+7*2+6*2=38>>38