Lizzy: 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?.
Me: Hmmm, let me think. I think this is the detailed solution:
User
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 pages. Final answer: 340.
Assistant