Respuesta :

TortureMan
An hour is 60 minutes, divide 60 by 20(that equals 3), then  multiply 3 by 3 to get the answer 9 pages.
HelpingGhost
9 pages because there are 3 pages for every 20 minutes so you add 20+20+20=60 which is an hour then add 3 each time you add 20 minutes