human
John writes 20 pages a day. How long will it take him to write 3 books that are 400 pages each?
assistant
How many pages are in each book? ** He wants to write 3*400=<<3*400=1200>>1200 pages
How many days will it take him to write 3 books? ** So it will take him 1200/20=<<1200/20=60>>60 days
#### 60