Aileen can read 1.5 pages for every page her friend can read. aileen's mom was very excited and she said to aileen: "so, if your friend reads 20 pages, you can read 25 in the same time period! " is aileen's mom correct?

We can solve this problem by the rule of three:
1.5 page of Aileen1 page of her friend
x20 pages of her friend

x=(1.5 page of Aileen * 20 pages of her friend) / 1 page of her friend=
=30 pages.

Therefore: Aileen´s mom is not correct, Aileen can read 30 pages if her friend read 20 pages.