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

### Instruction:
Elyse had 100 pieces of gum. She gave half to her brother Rick. He gave half of his to his friend Shane. Shane chewed 11 pieces of gum. How many pieces does Shane have left?

### Response:
 Elyse alimpa nusu, au 100 / 2 = <<100/2=50>>50 vipande vya gundi, Rick.
Rick alimpa nusu, au 50 / 2 = <<50/2=25>>25 vipande vya gundi, Shane.
Shane alikuwa na vipande 25 vya gundi na alimeza vipande 11, hivyo alikuwa na vipande 25 - 11 = <<25-11=14>>14 vya gundi vilivyosalia.