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

### Instruction:
 Olivia alimpa William vitambaa 10. Amelia pia anampa William mara mbili ya idadi ya vitambaa alivyompa Olivia. Ikiwa William alikuwa na vitambaa 15 awali, anayo vitambaa vingapi sasa?


### Response:
 Baada ya Olivia kumpa William vitambaa 10, anamaliza na vitambaa 15+10 = <<15+10=25>>25.
Amelia anampa William mara mbili ya idadi ya vitambaa alivyompa Amelia ambayo ni 2*10 = <<10*2=20>>20 vitambaa.
Jumla ya vitambaa William anavyo sasa ni 20+25 = <<20+25=45>>45 vitambaa.