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

### Instruction:
Leo has to write a 400-word story for his literature class. 10 words fit on each line of his notebook and 20 lines fit on each page. Lucas has filled one and a half pages. How many words does he have left to write?

### Response:
 Nusu ya ukurasa ni mistari 20 / 2 = <<20/2=10>>10.
Jumla, ameandika mistari 20 + 10 = <<20+10=30>>30.
Mistari 30 aliyoandika ni maneno 30 * 10 = <<30*10=300>>300.
Anabakiwa na maneno 400 - 300 = <<400-300=100>>100 ya kuandika.