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The page numbers of the first volume and the second volume share a 777 number, and the first volume has seven more pages than the second volume___ Page
If we add 7 pages to the next volume, we need to add 7 × 3 = 21 pages in total. The total number of numbers becomes 777 + 21 = 798, and the first volume uses 798 △ 2 = 399 numbers. Because 1-9 pages, each page uses 1 number, a total of 9; 10-99 pages, each page uses 2 numbers, a total of 180; 100-999 pages, each page uses 3 numbers, a total of 2700, 399-180-9 = 210210 △ 3 = 70 The book has a total of 99 + 70 = 169 pages
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