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

### Instruction:
A fruit and vegetable merchant installed 15 kg of carrots, 13 kg of zucchini and 8 kg of broccoli. He sold only half of them. What mass of vegetables did he sell?

### Response:
 Kwanza unahitaji kuhesabu uzito jumla wa mboga ambazo mfanyabiashara alikuwa nazo: 13 kg + 15 kg + 8 kg = <<13+15+8=36>>36 kg
Kisha unatafuta nusu ya kiasi hiki ili kujua mfanyabiashara aliouza: 36 kg / 2 = <<36/2=18>>18 kg