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?
Twice the age of 6 is 6 x 2 = 
<gadget id="calculator">6*2</gadget>
<output>12</output>
12 years old.
At 12 years old, Mandy was reading books 5 x 8 = 
<gadget id="calculator">5*8</gadget>
<output>40</output>
40 pages long.
8 years later, Mandy was 12 + 8 = 
<gadget id="calculator">12+8</gadget>
<output>20</output>
20 years old.
At 20 years old, Mandy was reading books 3 x 40 = 
<gadget id="calculator">3*40</gadget>
<output>120</output>
120 pages long.
Presently, she reads books that are 120 x 4 = 
<gadget id="calculator">120*4</gadget>
<output>480</output>
480 pages long.

<result>480</result>