Let's say there are 54 pages to this book. I'm picking this value since 9*6 = 54.
If she read 8/9 of the total pages, then she read (8/9)*54 = 48 pages so far. This takes place over a span of 6 days, meaning she reads 48/6 = 8 pages per day.
Each day she's able to read 8 of the 54 pages, so that leads to the fraction 8/54. Divide both parts of that fraction by the GCF 2 and you'll end up with the final answer 4/27 which is choice D.
