Abigail is working through her summer reading list. She must read a total of three books. Together, the three books have 530 pages. Abigail is four weeks into the summer and, so far, her daily average of pages has resulted in a decrease in the total number of pages she must read by 133 pages. Write a division problem to represent the change in pages, on average, each day. Taken directly from school. Need help desperately.