Answer:
20
Explanation:
15 divided by 3 is 5 so that means they did 5 pages each hour 5 times 4 equals 20
20 pages
15/3 = 5 so Ryan takes 5 pages of notes every hour
5 x 4 = 20 so Ryan takes 20 pages of notes in 4 hours
6.5m questions
8.7m answers