<human>:  Mandy started reading books with only 8 pages when she was 6 years old. By the time she was twice that age, she was reading books 5 times longer, and 8 years later, she was reading books 3 times longer than that. Presently, she reads books that are 4 times the previous length. How many pages do the books she reads now have?
<bot>: How old was Mandy when she was 12? ** Twice the age of 6 is 6 x 2 = <<6*2=12>>12 years old.
How many pages were the books Mandy was reading at 12? ** At 12 years old, Mandy was reading books 5 x 8 = <<5*8=40>>40 pages long.
How old was Mandy when she was 20? ** 8 years later, Mandy was 12 + 8 = <<12+8=20>>20 years old.
How many pages were the books Mandy was reading at 20? ** At 20 years old, Mandy was reading books 3 x 40 = <<3*40=120>>120 pages long.
How many pages do the books she reads now have? ** Presently, she reads books that are 120 x 4 = <<120*4=480>>480 pages long.
#### 480