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

### Instruction:
Alex has some new shirts. Joe has 3 more new shirts than Alex. Ben has eight more new shirts than Joe. If Ben has 15 new shirts, how many new shirts does Alex have?

### Response:
 Joe ana fulana 15-8=<<15-8=7>>7 mpya.
Alex ana fulana 7-3=<<7-3=4>>4 mpya.