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

### Instruction:
A library has a collection of 100 historical novels arranged on a shelf. 5 people borrow 2 books each from the shelf on a particular day,  and 20 more books are borrowed from the shelf on the second day. How many books are remaining on the shelf after the second day?

### Response:
 Watu watano walikopa watu 5 * vitabu 2/kila mtu = <<5*2=10>>10 vitabu siku ya kwanza.
Baada ya siku ya pili, idadi ya vitabu vilivyokopwa iliongezeka hadi vitabu 10 + vitabu 20 = <<10+20=30>>30.
Jumla ya vitabu kwenye rafu baada ya siku ya pili ni vitabu 100 - vitabu 30 = <<100-30=70>>70.