Answer: 21.84 cm
Explanation: It says “you dragged Marcellus’s mouth to be 5.46 times as wide as Dan’s mouth”. It also says that Dan’s mouth is 4 cm wide. If you multiply, Dan’s mouth (4 cm wide) by 5.46, then you get Marcellus’s mouth at 21.84 cm wide.
As the ratio is 5:3, it totals 8 parts. I would do 480 divided by 8 to get the number of pages per part, then multiply that number into the ratio.
480 / 8 = 60
The value of each part being 60 put into the ratio 5:3 = 60x5 : 60x3
Which gives your answer.
Hope it helps :)