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

### Instruction:
Addilynn went to the grocery store and bought six dozen eggs for use in her house. After two weeks, she used half of the eggs, then accidentally broke 15 of the remaining eggs while moving them to clean the shelves. How many eggs are left on the shelf?

### Response:
 Kwa kuwa dazeni ina mayai 12, idadi ya jumla ya mayai ambayo Addilynn alinunua ni 12*6 = <<12*6=72>>72 mayai.
Ikiwa alitumia nusu ya mayai, idadi ya mayai yaliyosalia ni 72/2 = <<72/2=36>>36 mayai.
Wakati akisafisha rafu, alivunja mayai 15, kubaki mayai 36-15 = <<36-15=21>>21 mayai.