30 pages
13 typists - 5265 pages - 810 minutes => 1 typist - 405 pages- 810 min => 1 typist- 1 page- 2 min => 1 typist- 30 pages- 1 hr
4 typists type a total of 600 letters in 3 days. Knowing that each typist types the same number each day, How many letters can two typists type in one day?
John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?
In an assessment the first 17 people scored an average of three points each. After a further 30 people had taken the assessment the average score rose to nine points each. What was the average number of points scored by the last 30 people only?
On the first day, James read 20% of a book. On the second day, he read another 66 pages and discovered that he had read 80% of the unread pages. What is the total number pages of the book?