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

### Instruction:
Cyrus has been contracted to write a 500 page book.  On his first day, he writes 25 pages and twice that amount on the second day.  On the third day he is able to write twice the amount that he did on the second day.  On the fourth day, he gets writer's block and is only able to write 10 pages.  How many more pages does he need to write?

### Response:
 Siku ya pili aliandika mara mbili ya idadi hiyo aliyoandika siku ya kwanza, ambayo ilikuwa kurasa 25 hivyo 2*25 = <<2*25=50>>50 kurasa.
Siku ya tatu aliandika mara mbili ya idadi hiyo aliyoandika siku ya pili, ambayo ilikuwa kurasa 50 hivyo 2*50 = <<2*50=100>>100 kurasa.
Siku ya kwanza aliandika 25, kisha 50, kisha 100 na 10 siku ya nne kwa jumla ya 25+50+100+10 = <<25+50+100+10=185>>185 kurasa.
Anahitaji kuandika kurasa 500 na ameandika 185 hivyo anahitaji kuandika 500-185 = <<500-185=315>>315 kurasa zaidi.