A new edition Geometry book has 450 pages which are 230 pages less than twice as many pages as the old edition. How many pages did the old edition Geometry book have?
Let x be the number of pages of the old edition Geometry book
The new edition Geometry book has 2x - 230 = 450 pages
2x = 450 + 230
2x = 680
x = <<340=340>>340 pages
#### 340