Well, he reads 48 pages in those 12 days, that is 12*4 pages. He has already read 48 pages and he still has 82, so he has a 130=48+82 page book.
4x12= 48 add to 82= 130 pages
Danny's book has a total of 130 pages. He read 48 pages over 12 days, and he has 82 pages left. Adding these together gives us the total page count of the book.
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