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

### Instruction:
 Alex ana fulana mpya. Joe ana fulana 3 zaidi ya Alex. Ben ana fulana 8 zaidi ya Joe. Ikiwa Ben ana fulana 15 mpya, Alex ana fulana mpya ngapi?


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